Here is my build. I finally soldered it up and took it for a test run.

Next, I will shorten the wires and fix up the 3D printed rat's nest which holds the BEC, capacitor and receiver.

I am not sure that I can really shorten the motor wires though.





BOM

RCMART
1 x Exotek Racing SPX PRO Carbon Fiber Chassis Conversion Set For HPI Sprint 2 (FREE SHIP) #1164 USD$78.80
1 x NOVAK 3-Amp High-Voltage Universal BEC 2S-7S #5463 USD$17.90
1 x NOVAK Glitch Buster Receiver Capacitor #5626 USD$11.90
1 x NOVAK Black Cooling Fan 25x25x10mm #5647 USD$11.50
1 x *Yeah Racing Aluminum Essential Conversion Kit For HPI Sprint 2 Silver #SPT2-S01SV (FREE SHIP) USD$79.90
1 x *Yeah Racing RC Teflon Bearing Set with Bearing Oil For 1:10 HPI Sprint 2 #YB0284BX USD$11.20
1 x GPM Titanium Completed Tie Rod Set 8pcs For HPI Sprint2 (FREE SHIPPING) #TSP2160-OC-BEBK USD$19.60 [FITMENT ISSUES]
1 x GPM Aluminum Alloy Mount Connecting Main Chassis & Sub-Chassis For HPI Sprint2 #SP2015-P USD$9.80
1 x *Yeah Racing Aluminum Endurance Conversion Kit For HPI Sprint 2 Orange #SPT2-S02OR (FREE SHIP) USD$89.90

Tough Racing
1 x Deans type T plug connector 2 set of male & female
1 x Stainless Steel Round Head Wrench Bolt M3*12(10)
1 x Stainless Steel Round Head Wrench Bolt M3*8(10)
2 x HPI Sprint RTR / Sprint2 Sport Front belt replace 87006
1 x TOUGH RACING TR42 Thread Lock Medium Strength(blue) 5ml
2 x HPI Sprint RTR / Sprint2 Sport Rear belt replace 87007

GPM Racing
HPI Sprint 2 Alloy Spur Gear Hub With Pin -1set - GPM SP2315
Team Losi Mini-t Delrin Spur Gear 48 Pitch 87T - 1pc - GPM DSP2087T

Novak
#3310 Hammer/NX4 Sensored 1/10 BL 4-Pole Combo- 3900Kv

Amazon
Contact RC Wheels+ Foam Tires
Some Chinese Wheels+ Rubber Tires

RPM
Blue Rod Ends x2