To the original poster... what did you do in the end? Did you make your camera? Are you in the process of making it?
I recently bought an old 9x12 plate camera, then after I realised that the bellows were shot, I figured I make my own camera that enabled me to make some straight square (actually, rectangular) bellows rather than tapered ones.
I'm starting by copying the rear standard, and I'm amazed at just how 'complex'(?) the back is to accept the plate holders. Fortunately for me, I'm also waiting to receive a Proxxon milling machine! That should make things a little bit easier! I'd like to make a field camera, but it's harder than it first appears - I'm trying to avoid buying a rack and pinion (seem hard to get hold of and expensive here in the UK) but then some sort of friction focus lock increases the bulk. There are so many trade-offs in the build!
Cheers,
David.