I redid my darkroom in 2016, on the cheap except for the West System epoxy for the plywood sink.
The 28" x 84" sink has built-in slope in two directions, so it could be installed level. I kerfed the back of the plywood and inlaid mahogany wedges to form the slopes. The sink aprons have dadoes matched to the slope, so it's well supported around the perimeter. I also did some structural fillets out of epoxy for extra strength.
I made a few base cabinets out of melamine. The open frame of the substrate (doubled-up strips of 3/4 plywood) allows the sloped base to be shimmed underneath for extra support.
The mixing valve isn't ideal. I used some globe valves and a tempering 'anti-sweat' mixer, along with an inline Miller thermometer. It works ok, but the temperature drifts a bit, depending on flow rate. There's a hot water tap that bypasses the tempering valve, and there are taps in two other locations for tempered water. The back splash is Formica over 3/8" plywood. The drain is vented with a Studor Redi-vent, which drains at the same rate as it did unplumbed.
I replaced my crappy VCT floor with plank linoleum. I like the new floor, it has a ship lap profile, with an adhesive edge that seals the both the long and short seams. It's a floating floor, so probably not ideal for really wet locations. I hated the VCT though, unless you buff and wax it regularly it gets pretty gross.
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