The 7664 TIE Crawler with two extra motors for driving and skid steering, controled with Technic Control Center (9753). It can drive without breaking and any gearbox damage (I need 3 days to build).
Are you crazy? This is extremly good, I have the set, too and never thought about that idea. If it can drive without braking it is 1000 of 5, great work, extremly great work!