Hey there!
The captain seat idea sounds kinda cool, I've never seen it myself, I'll be watching for responses. A guy could put a center console between them...
As for the throttle body, if you have an ounce of mechanical ability, you can bore your own. I did, and it works great. Find the instructions here:
http://www.go.jeep-xj.info/HowtoTBboring.htm
Good luck!