I have been meaning to post my Beseler 23C III XL frankenstein’ed copy stand. Works great for any size film and can quickly shift from 35mm to 4x5 or more in seconds. Got 2 enlargers at a local government surplus auction for $12 total. Use the Valoi system with CS Lite and light “enhancing” sheets, with a Staticvac film duster (lucky local find) and Panasonic Lumix S1R usually with a Sigma 70 ART. But considering the Sigma 105 ART soon for another project to get a native L-mount.
Experimented removing all the parts, bellows, light housing, etc. Lots of sturdy metal with pre-drilled and pre-threaded holes to utilize. Added a 200mm arca rail on a clamp to get plenty of space below the plate for the film holders for my head. Later added a NiSi macro rail for more easy fine-tuned control but I already had that for other projects, it is not 100% needed. Placed some anti-vibration pads under the whole thing, its quite heavy. I am unclear how much they help but they were cheap.