[Rollercoaster]

This project is more of a mechanical/electronics project then a computer project.

You will have majour problems with installing motors/gears and turning mechanics for the wheels and then u will have huge trouble controlling these mech thru digital ckts. sending signals and data exchange is the easiest part of it all.

SO if u really what to do this then u need three rare things-
1. a ingenious Mechanical engg dude
2. a electronics engg who is expert with digital ckts and basic microprocesors
3. a dumb programmer who can address the ports of the pc and read/write bits to those ports

Good luck!