Thank you, Dave. Yes, many, if not most, of the old panoramic photos of school groups, military, bands etc. were taken by Cirkut photographers. Eugene O. Goldbeck is probably the most well-known and prolific of them all.
For the springs on the back of my contact frame, I picked up 1/8”x3/4” aluminum strips from Lowes. I may swap them out for steel if I can find some thin enough, as I worry a little that they aren’t giving me enough pressure for good contact.
Here are a few snapshots of the frame and UV box in my darkgarage. There’s an 8x10 contact printing frame in there for scale. The box has a hinged door. It just happens to be open in these photos.