While building the lair for overkill I took a closer look at the plumbing for the sinks to go beside the bathroom. I took the 2x12 off the front of the bathroom floor and removed the nails. It is now attached with screws to make future removal easier. There is a 2-inch drain that feeds the bathroom sink that will be easy to tie into. I have purchased the fittings to do so and will get to it soon. I am not sure if there is a close vent to the bathroom. I assume there is an air admittance valve in the wall. I am thinking of putting one on the sink drains just in case. I have sinks and some taps I will donate. I will be building a clay trap for one of the sinks.
I have cleared out the kitchenette corner and put the kitchen supplies on the old Clayspace cabinet for now. The table is in front of the roll-up door. I am not sure if it should stay there but it seems like a good spot.
I plan to put in shelves for the whole corner as well as a small work surface.
Also, part of this plan is enclosing the furnace to reduce sound and putting in half-folding stairs to the mezzanine.
I will post more here as this project progresses.