If you have something that can cut glass cleanly, it's not too hard to make a passable ground glass from the glass in a cheap picture frame. Stained-glass shops and auto shops sell abrasive "grinding compound" powders; you basically put some compound on the glass, get it wet, sandwich it between the glass to be ground and a glass scrap, and apply some elbow grease. It's kind of time-consuming but not difficult.
I've never figured out a way to do it, but in principle anything that holds the film and fits properly on the rails should work. I suspect bending sheet metal would be the easiest way.Any possibility of DIY solutions to film holders? Such as using a light proof cloth cover and insert a plate with the film mounted somehow?
That's what I do. There are sheet-film daylight tanks, but a lot of them have a reputation for uneven development. A lot of people seem to like the so-called "taco method" as well.How about developing? Can I process 9X12 film with film developing chemicals as though I were developing paper (in complete darkness) in paper trays for example?