I made one years ago, has a G25 wheels setup and a glass backed race seat. I loved it for rally games on the PS3, even got some stage records. You are correct, the pedal and wheel force can be higher than what you would expect from a car in similar situations.
Anyone looking for a nice setup on a strong frame with wheels, the G25 and seat, let me know, I want to sell it. No room in the house for it anymore.