I'm forever robbing shutters out of old Polaroid Oscilloscope cameras. That leaves the 3.25 X 4.25 Polaroid packfilm holder and usually the remains of the camera sticking 3 1/2 inches in front. All you have to do is make a black matboard cover and a place to tape a foil pinhole on. 3X4 is a great pinhole size and it's instant (as instant as possible with a pin hole) gratification with the polaroid 108 or 667 films. If I use 665 I have a positive to look at and a negative that can go in the enlarger. Here's a couple of pics done that way. I enlarged the Tonopah Nev. Coke bottle bottom to 10X12 on 11X14 paper.