Anyone who has considered building a sitdown driving cab might be interested in building it around this:
http://www.bobearlracing.com/compat.htmlIt's very reasonably priced considering what you would pay for a seat elsewhere....*cough*Happ*cough*....
Cyberpunk, maybe you should consider altering your design around this thing or incorporating something similar. That is the main complaint I have with your sit down cab (just from pictures, I haven't tried it, mind you) -- it doesn't look like it would be comfortable for more than ten minutes.