This sort of reminds me of my own DIY 6x7 view camera, including the 'chunky' back (which makes short lenses impossible) and being disassembled to fold. There are pictures in the DIY thread. Mine is unapologetically an unrefined hacker project, and so appears the intrepid.
The real challenge is always the bellows and in obtaining a large focal length range in a compact camera. I am skeptical that improvement is possible over the century or so of commercial cameras. If you want to do something new, design a good design in CAD that can be entirely cut out of a common sheet of material with a laser or water jet and assembled with glue and commodity hardware. Sell pre-cut kits and open-source the CAD files on github so the community can make refinements. Partner with a waterjet company to accommodate these in a good pricing structure instead of the huge rates usually charged for custom work. Source bellows fabric and sell it precut. That would be a cool project you might make some small money on. If you intend to just make and sell these, good luck.
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