Well, I admit that I look at this from a one-off project with a huge amount of fine handy work, and buying a bellows.
I suppose you could outsource all the metal work and save a bundle if bought in bulk. I was amazed at what my company could buy things for (machined metal parts). If you then made your own bellows, you could save a lot, but I have no idea how much time would be involved? And then there's all that wood finishing, something I've always hated. It's just so easy to leave a scratch in the wrong place, or make a new one... I love woodworking but always hated the fine finishing...
So, we have some pople who want to make new cameras. Dave has plans and know-how. I have, ummm, well... interest? ;-) When do we start production?