Ok so I've been playing around with my losi rc car and looking for a couple of hop up parts when I came across a video of someone building a losi micro t using just spare parts you can buy. I was already hoping to build a small bare bones arduino from scratch so if I could combine that with just the chassis I reckon it would be possible to make a cool little robot chassis :D
It would also be great fun to build and I always like the micro rc's - would be quite expensive though =/
Picture it with an atmega328, h-bridge and ping sensor instead of the current electronics, only issue would be batteries....
I think the space for electronics is about 6x5cm although I may be wrong.