Thanks very much for the generous description of your slosher project, Monophoto.
I'm quite interested in making a different product and your plexiglass tips are encouraging. What I'd like to make is a compact, multi-sheet (say twelve sheets at a time) for stand-processing which could then be used as a water-economical washer. With stand processing in Rodinal, one can use just enough developer to cover the film plus - rather like 135mm film spacing in a 36 exposure stainless reel. Perhaps I'm dreaming, but it's all your fault for encouring us. Seriously, thanks for the info.