Here is a cost breakdown with part numbers to build a 180 Hp Super Cub with a basic glass panel.      
  The main price variables will be Engine, Propeller, Avionics layout, and Tires.      
                 
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  Part Description Quantity Supplier Name Part Number Price Total  
               
  PA-18 aircraft kit Backcountry Supercubs   39,600.00  
  Extended Wing Option Backcountry Supercubs   500.00  
           
  FireWall Forward        
           
  Zero Thrust Conical Motor Mount Backcountry Supercubs   1,500.00  
  Bolts (motor mount to firewall) Aircraft Spruce AN6-20A 0.77  
  Bolts (motor mount to firewall) Aircraft Spruce AN6-17 0.95  
  Washers (motor mount to firewall) Aircraft Spruce AN960-616 0.04  
  Nuts (motor mount to firewall) Aircraft Spruce AN365-624A 0.26  
  Nuts (motor mount to firewall) Aircraft Spruce AN363-624 0.44  
  Conical Engine Mount Bushings Aircraft Spruce 08-00662 39.50  
  Bolts (Engine to Mount) Aircraft Spruce AN8-45A 4.16  
  Washers (Engine to Mount Large) Aircraft Spruce AN970-8 0.35  
  Engine (IO-360 180Hp Superior) Backcountry Supercubs   24,650.00  
  Exhaust System Backcountry Supercubs   1,550.00  
  Alternator (60 Amp) Backcountry Supercubs   449.00  
  Propeller (MacCauley 84-44) Backcountry Supercubs 4695-876-516-3 3,510.72  
  Carb heat box w/filter & skull cap Backcountry Supercubs   435.00  
  Weldon Fuel Pump(fuel injected only) Aircraft Spruce & Specialty Co. 8136-A 632.00  
  Weldon Fuel Pump mount Aircraft Spruce & Specialty Co. 05-00021 23.65  
  Positech Oil Cooler Expmt Aircraft Spruce & Specialty Co. 4216MN 188.85  
  Oil Cooler Duct System Aircraft Spruce & Specialty Co. 08-05000 41.80  
  Aluminum Flange for Ducting Aircraft Spruce & Specialty Co. 10350-8 7.50  
  2" Scat Hose Aircraft Spruce & Specialty Co. 05-29908 6.75  
  Muffler clamp Wag-aero Group E-346-000 27.65  
  Restrictor Fitting Wag-aero Group A-123-003 8.35  
  Tack cable, 30" Wag-aero Group A-005-030 36.40  
  Warm/Cool Air Selector/Mixer Aircraft Spruce & Specialty Co. 08-00629 118.95  
  1" Teflon Anti-chaf tape 6YD Aircraft Spruce & Specialty Co. 09-31805 31.95  
  Engine Baffeling Backcountry Supercubs   400.00 400.00  
  Silicone 1/8"x36" Baffel seal Aircraft Spruce & Specialty Co. 05-00825 53.50  
           
  Instrument Panel        
           
  Dynon DEK D-180 Aircraft Spruce & Specialty Co. 10-01838 3,666.00  
  Garmin SL40 Slimline Comm Aircraft Spruce & Specialty Co. 11-02203 1,650.00  
  Garmin GPSMAP 496 America Aircraft Spruce & Specialty Co. 11-04684 2,395.00  
  Airgizmos Panel Dock Aircraft Spruce & Specialty Co. 11-03509 88.50  
  PM501 Panel mount intercom Aircraft Spruce & Specialty Co. 11-11800 269.95  
  Falcon Airspeed 3-1/8 -120MP Aircraft Spruce & Specialty Co. 10-02915 117.95  
  Garmin GTX327 Digital Transponder Aircraft Spruce & Specialty Co. 11-00329 1,895.00  
  Ameri-king AK-350 Aircraft Spruce & Specialty Co. 11-12010 169.95  
  Airpath Compass Panel mount Aircraft Spruce & Specialty Co. 10-01341 137.95  
  A-930 Throttle Cable 48" long Aircraft Spruce & Specialty Co. 05-30048 39.75  
  Throttle Cable Rod End Aircraft Spruce & Specialty Co. MW-3 5.75  
  Throttle Cable Rod End Aircraft Spruce & Specialty Co. MW-4 6.25  
  A-790 Control 60" Red Knob Aircraft Spruce & Specialty Co. 05-08160 57.95  
  A-730 Control 84" Black Knob Aircraft Spruce & Specialty Co. 05-13684 26.50  
  Cabin Heat Insert Aircraft Spruce & Specialty Co. 05-14420 0.70  
  Carburetor Heat Insert Aircraft Spruce & Specialty Co. 05-14410 0.55  
  Control Cable Mount Bracket Aircraft Spruce & Specialty Co. 10465 19.50  
  Cable End "B" Nut Aircraft Spruce & Specialty Co. 05-16240 8.85  
  Fork Threaded Rod End (throttle cable) Aircraft Spruce & Specialty Co. AN486-3P 16.90  
  Throttle Cable Clamps Aircraft Spruce & Specialty Co. AN742-D4 0.20  
  Cable Housing Clamps Aircraft Spruce & Specialty Co. AN742-D3 0.23  
  A-920 48" Push Pull Control Aircraft Spruce & Specialty Co. 05-12748 38.75  
  Ball Joint Assy Comm. 10-32 Aircraft Spruce & Specialty Co. 05-07400 3.35  
           
  Electrical        
                 
  Landing Light Lens kit Backcountry Supercubs   120.00  
  GE Quartz Lamp GE-Q4509 Aircraft Spruce & Specialty Co. 11-03902 29.85  
  LED Streamline Combo Nav/Strobe Backcountry Supercubs DDM-SLC 379.00  
  Airspeed Post Light Aircraft Spruce & Specialty Co. A350-14R 35.95  
  Odyssey dry cell PC-680 Aircraft Spruce & Specialty Co. 11-02233 107.95  
  Cessna split master switch Aircraft Spruce & Specialty Co. 11-15900 21.85  
  Housing Mnt for Master Swtch S Aircraft Spruce & Specialty Co. 11-15910 1.95  
  Master Solenoid 111-226 Aircraft Spruce & Specialty Co. 11-03161 21.85  
  Starter Solenoid 22735 Aircraft Spruce & Specialty Co. 11-03162 9.85  
  Ignition Switch A-510-2 Aircraft Spruce & Specialty Co. 11-03170 88.95  
  Alternator Circuit Breaker 60 Amp Aircraft Spruce & Specialty Co. 11-02191 15.30  
  Alternator Field switch/breaker Aircraft Spruce & Specialty Co. 11-03936 25.85  
  Radio,L/L, Taxi Light switch/breaker Aircraft Spruce & Specialty Co. 11-03932 25.75  
  LED Nav Light, Strobe switch/breaker Aircraft Spruce & Specialty Co. 11-03936 25.85  
  Boost Pump switch/breaker Aircraft Spruce & Specialty Co. 11-03932 25.75  
  Interoir light, Spare circuit switch/br Aircraft Spruce & Specialty Co. 11-03931 25.75  
  Wire Unshd 22759/16 8GA White Aircraft Spruce & Specialty Co. 11-14508 2.15  
  Wire Terminals Aircraft Spruce & Specialty Co. 33461 0.48  
  Wire unshd 22759/16 2GA White Aircraft Spruce & Specialty Co. 11-14502 4.76  
  Wire Terminals Aircraft Spruce & Specialty Co. 321600 1.42  
  Wire Unshd 22759/16 14GA White Aircraft Spruce & Specialty Co. 11-14514 0.44  
  Vinyl Insulated Ring Terminals Aircraft Spruce & Specialty Co. 31902 0.19  
  Butt Type Splice Connectors Aircraft Spruce & Specialty Co. 34071 0.21  
  MS25171-4S Rubber Boot Aircraft Spruce & Specialty Co. MS25171-4S 1.16  
  MS25171-2S Rubber Boot Aircraft Spruce & Specialty Co. MS25171-2S 1.18  
  Power/Data Cable (to hardwire GPS) Aircraft Spruce & Specialty Co. 11-02694 21.95  
  Pos & Neg Bus Bars Aircraft Spruce & Specialty Co. 03-00134 5.50  
  Cable Ties Aircraft Spruce & Specialty Co. 11-04230 0.05  
           
  Antenna        
           
  Transponder Antenna Aircraft Spruce & Specialty Co. 11-17970 96.75  
  Transponder Cable Aircraft Spruce & Specialty Co. 11-04258 0.46  
  VHF Comm Antenna Aircraft Spruce & Specialty Co. AV-529 107.95  
  VHF Cable Aircraft Spruce & Specialty Co. 11-04239 0.57  
  Male Cable End Aircraft Spruce & Specialty Co. 11-03992 4.50  
  Female Cable End Aircraft Spruce & Specialty Co. 11-03993 3.25  
           
  Safety Equipment        
           
  AC43.13 FAA Standards Book Aircraft Spruce & Specialty Co. 13-11350 21.50  
  ELT Aircraft Spruce & Specialty Co. 11-02790 139.95  
  Fire Extinguisher Aircraft Spruce & Specialty Co. 13-07650 104.5  
  First Aid Kit Aircraft Spruce & Specialty Co. 13-02944 28.75  
           
  Airframe        
           
  Side Window Glass (0.080" plexi) Aircraft Spruce & Specialty Co. 03-49910 72.50  
  Pulley Cover, STD Wag-aero Group M147000 3.35  
  Plastic Inspection Grommets (set) Backcountry Supercubs   135.00  
  Tie Down Rings Backcountry Supercubs   32.00  
  No step Placard Aircraft Spruce & Specialty Co. 09-34500 4.45  
  Ext. Data Airframe Placard Aircraft Spruce & Specialty Co. 09-01631 4.75  
  Rac Stick Grip G1 (Control sticks) Aircraft Spruce & Specialty Co. 11-09930 37.50  
  Pitot Tube Protector Aircraft Spruce & Specialty Co. 10-02000 7.95  
  Nylon Tubing (Airspeed) Aircraft Spruce & Specialty Co. 05-01011 0.84  
  Piper pawnee spinner assy Univair Classic Aircraft Parts U14422-B 455.00  
  MW-3 Aurora Bearing Aircraft Spruce & Specialty Co. MW-3 6.25  
  Interoir Panel Set Backcountry Supercubs   1,500.00  
  Ultra Leather Interoir fabric Per Yrd Backcountry Supercubs   70.00  
  3M Contact Cement (Interoir Panels) Aircraft Spruce & Specialty Co. 09-01444 13.25  
  Seat Upholstery Set Backcountry Supercubs   800.00  
  Gel Contact Cement (Tank Straps) Aircraft Spruce & Specialty Co. 271 6.75  
  Glue Brush for Contact Cement Aircraft Spruce & Specialty Co. 09-21400 0.33  
  Front Seat Belt (Hooker In. Real) Backcountry Supercubs   355.00  
  Rear Seat Belt (Hooker Fixed 5 Point) Backcountry Supercubs   200.00  
           
  Rubber Channel (wing fairing skylight) Aircraft Spruce & Specialty Co. 05-00596 0.85  
  Rubber Channel (Front Windshield) Aircraft Spruce & Specialty Co. 05-01300 0.99  
  Rudder arm, 3/4" shank Aircraft Spruce & Specialty Co. 06-15900 36.20  
  Tailspring connection Aircraft Spruce & Specialty Co. 2151 48.85  
  Wing Root Fairing Kit Backcountry Supercubs   185.00  
  Under seat storage box/battery box Backcountry Supercubs   245.00  
  Control Cable Fairings Aircraft Spruce & Specialty Co. 05-05750 4.35  
           
  Brake Parts        
           
  Nylaflow nylon tubing Aircraft Spruce & Specialty Co. 05-00115 0.34  
  Brass Poly-Flo Elbow Aircraft Spruce & Specialty Co. 269P-04x02 2.50  
  Male Branch TEE Aircraft Spruce & Specialty Co. 3600x2 3.50  
  AN823-4D (45 degree elbow) Aircraft Spruce & Specialty Co. AN823-4D 5.85  
  AN822-2D Elbow Aircraft Spruce & Specialty Co. AN822-2D 9.90  
  AN816-2D Nipple Aircraft Spruce & Specialty Co. AN816-2D 2.40  
  Matco Parking Brake Valve Aircraft Spruce & Specialty Co. 06-17200 113.95  
  Brake Reservoir Aircraft Spruce & Specialty Co. A-315 30.85  
  Brake Pedals Backcountry Supercubs   605.00  
  AN819 Sleeve Aircraft Spruce & Specialty Co. AN819-4D 0.36  
  AN818 Nuts Aircraft Spruce & Specialty Co. AN818-4D 1.14  
  AN815 Union Aircraft Spruce & Specialty Co. AN815-4D 1.71  
  AN822 Elbow Aircraft Spruce & Specialty Co. AN822-4D 6.50  
  AN833 Elbow - Bulk Head Aircraft Spruce & Specialty Co. AN833-4D 6.00  
  Aeroshell Brake Fluid (Quart) Aircraft Spruce & Specialty Co. 09-27000 8.85  
           
  Tires        
           
  McCreary Airtrac 850-6 6Ply w/tubes Aircraft Spruce & Specialty Co. 06-21175 531.00  
  "Cub" Metal Hub Caps Aircraft Spruce & Specialty Co. 06-00020 24.50  
           
  Hardware            
  Bolts            
                 
  Backcountry Supercubs Hardware Kit Backcountry Supercubs   0.00 No Charge  
  AN23-11 Clevis Bolt Aircraft Spruce & Specialty Co. AN23-11 0.70  
  AN3-5A Aircraft Spruce & Specialty Co. AN3-5A 0.10  
  AN3-7 Aircraft Spruce & Specialty Co. AN3-7 0.52  
  AN5-16A Aircraft Spruce & Specialty Co. AN5-16A 0.39  
  AN5-17A Aircraft Spruce & Specialty Co. AN5-17A 0.46  
  AN6-26A Aircraft Spruce & Specialty Co. AN6-26A 1.10  
  AN7-21A Aircraft Spruce & Specialty Co. AN7-21A 1.37  
           
  Washers        
           
  AN3 Washer Aircraft Spruce & Specialty Co. AN960-10 0.02  
  AN3 S/S Washer Aircraft Spruce & Specialty Co. AN960C-10 0.04  
  AN4 Washer Aircraft Spruce & Specialty Co. AN960-416 0.03  
  AN5 Washer Aircraft Spruce & Specialty Co. AN960-516 0.03  
  AN6 Washer Aircraft Spruce & Specialty Co. AN960-616 0.04  
  AN7 Washer Aircraft Spruce & Specialty Co. AN960-716 0.06  
  AN8 Washer Aircraft Spruce & Specialty Co. AN960-816 0.06  
  AN970-5 (Penny Washer) Aircraft Spruce & Specialty Co. AN970-5 0.12  
  04-00362 "U" Type Tinnerman Aircraft Spruce & Specialty Co. A1785-6Z-1D 0.36  
           
  Nuts        
           
  AN3 Castle Nut Aircraft Spruce & Specialty Co. AN310-3 0.40  
  AN6 Castle Nut Aircraft Spruce & Specialty Co. AN310-6 0.97  
  AN3 S/S self locking nut (brake leg) Aircraft Spruce & Specialty Co. Com365-1032 0.06  
  AN5 Self Locking Nut Aircraft Spruce & Specialty Co. AN365-524A 0.15  
  AN6 Self Locking Nut Aircraft Spruce & Specialty Co. AN365-624A 0.26  
  AN7 Self Locking Nut Aircraft Spruce & Specialty Co. AN365-720A 0.86  
  Two Lug Anchor Nuts Aircraft Spruce & Specialty Co. K1000-06 0.51  
  Two Lug Anchor Nuts Aircraft Spruce & Specialty Co. K1000-08 0.61  
  Two Lug Floating Anchor Nuts Aircraft Spruce & Specialty Co. F5000-08 0.89  
  Nut, castle Aircraft Spruce & Specialty Co. AN310-5 0.70  
  MS21045-8 Nut Stop Aircraft Spruce & Specialty Co. AN363-820 1.12  
  Camloc 2600 LW Retain washer Aircraft Spruce & Specialty Co. 2600-LW 0.45  
  Camloc CAD Wing stud Aircraft Spruce & Specialty Co. 2600-4W 7.50  
  Camloc 2600/2700 RECPT Aircraft Spruce & Specialty Co. 212-12N 3.10  
           
  Cotter Pin        
                 
  AN3 bolt Aircraft Spruce & Specialty Co. MS24665-132 0.02  
           
  Safety Wire        
                 
  0.041" S/S Safety Wire Aircraft Spruce & Specialty Co. 05-02687 7.25  
           
  Screws        
                 
  Screws (engine baffle to cylinder) Aircraft Spruce & Specialty Co. AN526C-428-8 0.28  
  Lock Washer S/S engine baffle Aircraft Spruce & Specialty Co. MS35333-74 0.06  
  Windshield Screws Aircraft Spruce & Specialty Co. AN526C832-8 0.08  
  Truss Phil M/Screw 10-32X1/2 Aircraft Spruce & Specialty Co. AN526-1032-8 0.09  
  S/S Machine Screw (brake line legs) Aircraft Spruce & Specialty Co. AN526C-1032-8 0.15  
  Truss Phil M/Screw 10-32X3/4 Aircraft Spruce & Specialty Co. AN526-1032-12 0.07  
  Truss Phil M/Screw 8-32X1/2 Aircraft Spruce & Specialty Co. AN526-832-8 0.06  
  6X3/8 screws Aircraft Spruce & Specialty Co. T6x6 0.03  
  6X1/2 screws Aircraft Spruce & Specialty Co. T6x8 0.03  
  6-32 x 3/4" Instrument Screws Aircraft Spruce & Specialty Co. AN515B6-12 0.10  
  Screw, Brass INSTR. Aircraft Spruce & Specialty Co. MS35214-31 0.16  
  Electric Bus Bar Screws Aircraft Spruce & Specialty Co. NAS602-4P 0.08  
  4-40 x 1" pan-head screw (stringers) Aircraft Spruce & Specialty Co. MS51957-21 0.07  
  4-40 stainless elastic stop nut (stringer) Aircraft Spruce & Specialty Co. Com364-440 0.09  
           
  Clamps        
                 
  DG3 Adell Clamps Aircraft Spruce & Specialty Co. MS21919-DG3 0.32  
  DG4 Adell Clamps Aircraft Spruce & Specialty Co. MS21919-DG4 0.21  
  DG6 Adell Clamps Aircraft Spruce & Specialty Co. MS21919-DG6 0.24  
  DG14 Adell Clamps Aircraft Spruce & Specialty Co. MS21919-DG14 0.38  
           
  Fuel System        
           
  Site Tube Gauges (set of 2) Backcountry Supercubs   150.00  
  Cav-160 Fuel tank drain valve Aircraft Spruce & Specialty Co. CAV-160 11.50  
  Fuel Tank Finger Straners Aircraft Spruce & Specialty Co. 05-17700 5.85  
  Fuel Shut-Off Valve Aircraft Spruce & Specialty Co. 6749 24.85  
  Fuel Line 3/8" Tubing Aircraft Spruce & Specialty Co. 03-40600 0.63  
  Nylaflow Fuel Line Aircraft Spruce & Specialty Co. 05-00300 0.65  
  Nylaflow Fuel Line Aircraft Spruce & Specialty Co. 05-00400 0.67  
  AN816-6D Nipple Aircraft Spruce & Specialty Co. AN816-6D 3.80  
  Sleaves AN819-6D Aircraft Spruce & Specialty Co. AN819-6D 0.93  
  Nuts AN 818-6D Aircraft Spruce & Specialty Co. AN818-6D 1.60  
  An824-4D Flared Tee Aircraft Spruce & Specialty Co. AN824-4D 6.25  
  AN822-6D Elbow Aircraft Spruce & Specialty Co. AN822-6D 6.25  
  AN825-6D TEE Aircraft Spruce & Specialty Co. AN825-6D 6.70  
  AN840-6D Adapter Aircraft Spruce & Specialty Co. AN840-6D 3.95  
  AN842-4D Elbow Aircraft Spruce & Specialty Co. AN842-4D 11.50  
  Elastic Grommets Aircraft Spruce & Specialty Co. AN931-4-7 0.12  
  AN910-2D Coupling Aircraft Spruce & Specialty Co. AN910-2D 3.45  
  AN912-2D Bushing Aircraft Spruce & Specialty Co. AN912-2D 2.10  
  AN914-2D Elbow Aircraft Spruce & Specialty Co. AN914-2D 7.90  
  AN924-6D Bulkhead Nut Aircraft Spruce & Specialty Co. AN924-6D 1.86  
  AN929-6D CAP Aircraft Spruce & Specialty Co. AN929-6D 1.33  
  Plastic line caps (protect while work) Aircraft Spruce & Specialty Co. 04-00049 0.12  
  Ram Air Pressure Fuel Cap Wag-aero Group E-481-000 37.95  
  ACS Gascolator Aircraft Spruce & Specialty Co. 10580 69.50  
  Gascolator Mounting Bracket Aircraft Spruce & Specialty Co. 10371 17.90  
  Primer (Carburated Only) Aircraft Spruce & Specialty Co. 05-19920 87.75  
  Loctite 545 Sealant Auto Parts store   8.00  
                 
          Price to Build Total