I had a try at this a few years ago with a small cam off ebay but found the rf interferance from the motor really interrupted the signal when the throttle was full open. I never got the system properly tested though, it was a friends system and I dont think the 9v batterys he had werent particularily fresh
I would love to have a go with something a bit more high tech, we had a quick go at driving by looking at the screen too. That was interesting to say the least.