| I like that kind of stuff. I made my two year old daughter's powerwheels remote control since she wasn't quite strong enough to do the steering yet. In order to handle the torque required to turn this huge powerwheels I had to build a custom giant servo. I used a seat motor from a car and the brains of a servo to control the movement. The servo's circuitry doesn't actually connect to the internal motor of the servo any more. It just feeds a conditioning circuit I build that conditions the signal for a H-bridge circuit I built in college. The H-bridge is what actually drives the seat motor. I installed mechanical limit switch's that disable the h-bridge just in case the servo control circuitry looses signal or malfunctions. This motor could tear apart the powerwheels if it did not know when to stop. 
Screwing around with generating my own pwm signals from a microcontroller:
Here's a video of it in action:
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That sounds like fun. - 
