shouldn't be too hard to get the controls. I tear apart my old Playstation steering wheel and inside was a potentiometer for steering. replace it with the one in your controller and wire it up. pretty sure the pedals were the same. don't remember.

the hard part of the project seeing where its going and moving the thing. I always wanted to build one with a chair and bring it to the track for racing. imagine the looks on the other racers. haha