I have been wanting to make an RC car for a while... finally got around to making one from spare parts but it didnt work particularly well...
A Pushchair was left abandoned on the street after the local kids had had their fun playing about on it ( /classy area/ ), I nabbed it as the frame seemed pretty intact even though the tyres were flat and the fabric was worse for wear and set about adapting it.
Several 3D printed brackets and pulleys later, a couple of toothed belts and some RC gubbins and behold! It lives!
The acceleration is reasonable; wheelies are possible :-)
Disclaimer: This is not good for the motors (950KV quadcopter motors), they have very little startup torque and they scream a bit.