Ok, at this point my driving cabinet plans are still a CAD dream but I have been quite busy collecting all of the needed items on e-bay. So far I have a 360 and a 270 steering system which can be removed and replaced by each other. I also won a pretty nice set of pedals as well as 2 different types of shifters.
The only thing that has been holding me back from starting the construction of this cab was the fact that I really needed a racing seat for under $50
(I'm trying not to tip off the wife, if you know what i mean) 
. Well after a few endless hours on Google I was able to find a company in CA that fabricates fiberglass bucket seats
http://www.pape-ent.com/. I plan on installing a few key parts of a rumble vest to the underside of the seat which will make it a rumble seat.
Anyway, I just fingured I would pass along the link.
Thanks
Charlie