On the back side of the bellows/frame, where they attach to the body of the camera - does anyone know the thread size and pitch for these screws? And preferably their length, though that's not as important. I don't have anything small enough to measure the holes.

I ripped this parts camera apart years ago but recently found it - I'm building a custom camera (or at least thinking about how it could work). Easiest option I think is a simple wooden plate to the large cutout here attached instead to the bellows frame, and then I can build the rest needed off that wooden plate - I'm using a super-wide lens with helical mount, so fairly straightforward once the camera body has a light-tight attachment point for the lens.

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