A variant on the other design. This one is for Patterson tanks which I never use. In the process of developing these sheets, I learned a few things, enough to realize this design is unworkable. But an improved version is done and ready to be cut and assembled.
What I learned was that the central column in a Patterson tank is part of the light trap (oops). No harm done but a dumb mistake. So the next iteration incorporates that. Also, Patterson tanks use a lot more solution: I was 200ml short at 800ml when I should have used a full 1000. So that meant the images were un[der]developed along the topmost part of each sheet.
The next version will have no metal components at all, as that adds cost (a 6 inch stainless steel bolt is $5?!) and not using stainless means there may some issues with the development process. If tanks and reels are made of stainless, that's where I should head — unless I get rid of metal parts altogether.