Neat camera strap! Darn clever idea for a shutter too.
I have a couple of broken Kodak folders that took 116 film, the bellows were like lace curtains and both had broken support arms. I remounted the lenses for my 4X5 and they will cover without too much falloff at f16 and smaller. The bodies sit in my junk box. Looks like I could rig the body to take 120 film and use them as a pinhole wide angle camera. Or put a septum in the middle, two pinholes and make a pinhole stereo.