The ground glass sits on the same plane as the film, supposedly. The easiest way to set your GG up is to have a back that will take a frame, usually recessed with locking tabs to hold it in place. Decide on what type of film holders you are going to use and design your camera back around that.
Hubby suggested that I just order a double sided film holder and we build the camera body around that.
You can actually buy 122 film at Central Camera:
http://www.centralcamera.com/Film/Film-for-Older-Cameras/
I've been tempted for one or two of my oldies, but it's pretty expensive.
I also have a 122 folder. There was a guy on Photo.net a few years back who was converting large rollfilm folders into panoramic 120s. The results were amazing. All you really need are some spacers for the spools and a down and dirty mask to keep the film from bowing in the frame. A red window in the right spot would be nice, but you get so few images on a roll you could just advance with the "count the turns method". You might want to give it a try before you hack it apart for the 4x5 mod.
The trick to rolling your own is to unroll the film and paper loose in your hand. That is, as you take it off of the roll, re-roll it loosely in your catch hand. The film is taped at the spool end onto the paper and when you re-roll onto the 122 or 620 spool pull it tight. If you unroll onto one spool first, the film will bunch up at the taped end and make it hard to re-roll. Does that make sense?
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