One camera in 9 forms: a 3D printed modular medium format film camera body
petapixel.com
petapixel.com
If there were some way to couple a rangefinder, I'd be interested. There's a reason, though, that medium-format rangefinder cameras cost $thousands.
I can only dream about a time when you could easily shoot B&W Polaroid in medium format or larger. They're practically giving away the Polaroid film backs on eBay. I should pick one up for each of my modulars in case some enterprising soul should decide to start up Polaroid film production again. (Reminds me of the older Hi-Fi vacuum tube variants ... they certainly have a longer shelf life though than film.)
I had an RB67 kit for a while. Awesome camera but beastly. I ended up trading it for a Hasselblad.