How about a cheap standard radio controlled car you can buy off the shelf at a store, but with a custom controller built around a M68000 processor that takes the 4 switch inputs and converts them to the appropriate signals necessary to control the car.

What's your academic level (University, high school, etc), time frame and budget?

university level, time frame is about 1 month, and budget around 200

yah, me too doing this kind of project. did anyone can help me?

Well if you two are in the same class perhaps you could offer more information to help us narrow down a suitable project that fits the scope of your project and qualification level (ie- project technical difficulty).

Please provide more information on the project requirements.

try to search the project at www.mylab.tk