Its a cool concept, but there are soooo many variables, some of which have no logical basis. For example: I need a high precision servo because I want my car to turn fast and accurately, I need a (3-phase motor or an H-bridge) so that I can slow down very quickly, I need a motor which has high torque, uses electricity, and wont emit a large magnetic field (because that could mess up the sensor input), I want a microcontroller which has a C++ compiler, a USB interface, and 4 A2D ports, I also need parts which weigh as little as possible, and the list goes on.