I think a good start would be the measurements of each major component. The rear standard and the camera base are the part that would intimidate me the most. I can probably figure some of it out -- I mean if I want to shoot in either vertical or horizontal orientation, then the rear attachment for the bellows would need to be greater than 14x14. But I'm sure these measurements and knowledge is out there. I also don't know things like how I'd attach the bellows, the spring back and film loader, and how the lens boards would interface with the front standard. Designing in front and rear movements doesn't seem so hard, though making detents to zero the standards is a different story.
I'd make it from wood, and I'd probably choose a sort of folding camera design with a tracked base, and that allowed vertical or horizontal positioning of the back.
I've got minimal woodworking skills, but I have some friends who are very good at it, so I could run the procedural stuff by them.