I had a hard drivin' sit down cockpit, it was fun, but the cabinet had some water damage, and the game was not as fun as my other sit down racer I have (San Francisco Rush the Rock Alcatraz). I was thinking about turning it into an Xbox racer cab, but when I started stripping the cab parts to see what it would take to fix the water damage on the side, it became apparent that I would pretty much have to destroy the whole cabinet to get the side off (it's glued and stapled everywhere).
It worked out in the end though, we got it all put back together and working nicely, and traded it to our local arcade for a Crystal Castles arcade + $300 store credit at his video game store (he runs an arcade and video trade in store). I was able to get my Xbox 360 with that trade-in money (I don't think I would have every bought one for full price, but it was definately worth the trade).
Sadly, I went in the arcade the other day, and the Hard Drivin' is just sitting in a corner out of commission. He never installed his locks on the coin door and I think some kids monkeyed with the insides and broke it. It will probably take quite a bit to get it up and running again. Oh well, not my machine anymore (still hurts

).