Sounds like plenty of cameras, though I think you need a 6x7, or something that will accept a 6x7 back. 6 x 4.5 is a lot of fun too . . . not to mention 4x5 inch. I really like the 6x7 and 645 formats; there's no need to crop for standard print papers, and the taller formats suit the way I like to compose. 6x7 and 6x6 are especially great shapes to compose with. I have too many SLRs, but people keep sending them to me, and I can adapt virtually all of the SLR lenses to my Fujis. Even the Pentax DSLR can use all the old Pentax-K mount and M-42 mount SLR lenses as well as Mamiya 645 lenses. I only own one half-decent modern Pentax AF lens (the plastic fantastic 35mm/2.5). I also counted several crap cameras, such as Holgas and old box cameras . . My pile of old photo gear actually generates a lot more than 40 cameras, if you count all the combinations of bodies, lenses, and roll-film holders. The view camera, the press camera, the homemade film camera, and a couple of 3D printed camera bodies can all use some of the Graflok standard film holders, covering 6x6, 6x7, 6x9 and 4x5. All of these cameras have interchangeable lenses, viewfinders, ground glass backs, etc. In addition to that I have a sliding shift-stitch adapter to mount the Pentax DSLR on four of these Graflok bodies, producing very large panoramic files. Another shift-stitch adapter lets me shoot any of the Fuji-X cameras through Mamiya 645 lenses, stitching up to 8 shots together for extremely high resolution digital files covering a lot of the 645 image circle. Most of my intentionally purchased camera gear was chosen to fit into an elaborate system of interchangeable and widely-shareable components, though some of my favorite cameras are fixed-lens stand-alone models. The digital DSLR has a part to play in this elaborate game, though I did replace it's focusing screen with a cut-down ground glass screen from an old Nikon SLR. The older screen is much better for focusing manual focus lenses than the typical DSLR matte screen.