Personally I don't like tray processing, Theirs to many possible mistakes lurking. With so many labs going digital or being forced out of business due to digital and schools with less chemistry based photo classes theirs lots of used dip tanks out their that with a little effort can be cleaned and modified to process sheet film. I found my 4 tanks and various hangers for $10.00. When I need more hangers I use a shirt hanger with miniature spring clamps (plastic tipped) to suspend the film in the tank. Thus eliminating my biggest problem of scratches on my precious film.