If a custom "race" car is to be made, why develop 10 or however many the same over? SlotTech have it licked! you get the car you want, and they will look at your circuit your driving style and develop a car around it.
lets take a look at the price..
£10 slot it axle kit
£6 front axle
so far £51 excluding tuning/time and what ever else might be in there.
LSI, the lights are on but no wheels are spinning, so I am assuming there is a capacitor in there
no offence, but car have to be tuned personally or tuners to be well recognised race winners like SlotTech cars as an example