i agree with Nigel. and what is the use of the PC in all this. u can just directly interface a joystick to control the car without the need for the PC.
but if u have studied digital image processing then it would be great if u used your skills. then there will be the need for a PC. the images from the car would be processed and the car would be steered accordingly. suppose an atmosphere that is very harsh, like mars. and the car has to move in that enviroment based on digital image processing algorithms. that might impress your teachers