I am in the process of setting up a darkroom in a similar space. The solution I have decided on, and I'm working on right now, is to make a two level area above the tub. Mine will be 2x4 frames that sit on the tub and support 1" plywood surfaces.

On top I'm placing a large plastic tray to use for my sink. It is actually designed to hold 55 gallon drums and contain spills. I'll drill it at one end and attach a PVC drain to go directly down to the tub drain. This will give me room for 4 trays (12x16) on top and storage and a print washer underneath.

I have been just using some old plastic shelving placed across the tub which works OK but I wanted to have an area that was easier to clean.

BTW, where is "just north of Inferno?"