Boxster trans?
 

Anybody else doing this trans work? http://www.gboxweb.com/boxsterracetrans.html

Look up a member named Brad Roberts (that's his screen name). If anyone on this board knows about this, it will be him.

Any gearbox builder can properly put together one of these boxes, they're not rocket science and the components relatively freely available. Heck, Gbox will sell you parts if you need them.

That said, I would certainly consider having Gbox build your box if you're in the market for this service. Their prices are fair, and they do stellar work.