This looks like a nice darkroom
Is there any room for a second door out of the darkroom??? Possibly at the utility sink area.
As well do you have enough space for maintenance on the Ra4 processor. Axcess from both sides.????
If the ceilings are high enough you could make drying racks above the sink.It looks like you have 22 ft of wall to use. I could send you jpegs of the set up I use for air drying that has been very useful.
One other point. In the summer months you will need a de-humidifier and in the winter months a humidifier. could these units be close to the hot water heater??
How are you making the sinks , I would be interested in that.