What are the dimensions of your room, which RA-4 processor did you score, and will you have any sink/water source in the room at all?
I'm in the very late stages of building my new semi-dry darkroom (13x14 feet) along with a CP-32 processor for RA-4 and a SK-8 for film - both for dry-to-dry processing but allowing for occasional 30" tray processing. The new dedicated room is now constructed as part of the new house (just moved in recently so finishing the darkroom had been a little delayed), but I'm now just waiting for 16 feet of cabinets to arrive in less than 2-weeks and then a custom 30" deep L-shaped countertop. I'll be forgoing a traditional long sink and instead plumbed it for an oversize standard stainless sink and a digital Intellifaucet as well, but I'm making the countertop extra deep to accommodate the processors and large trays.
Mike