I think that's a great idea. I briefly considered doing a Pole Position cab a while ago, but didn't give it too much thought. The only thing I can think of for a gas pedal setup would be to use a PC style gas pedal on the floor. I don't think Pole Position had a break pedal, did it? Although you might want to include a break pedal to open it up for other driving games.
Interesting idea...I may have to follow up on that.