You can design the car yourself but I can offer help with how to power it. If you make it a 3 wheeled car (two at the back and one at the front) you can use the elastic band to power the front wheel. Attach on end of the band to a fixed point and the other to the axel of the front wheel. You can then wind up the wheel, which twists the elastic band and when you release it the stored energy in the elastic will unwind it, moving the wheel and propelling the car forward.
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