After never using the head sink for several years, and tossing junk into the cupboard under it, and also doing the "move the sail bags from the V berth at night and from the cabin berths in the morning" sthick too many times-
I took out the sink and countertop, and am building a sail box in the now much larger space.
The old arrangement:

Tacky soap dish and all.
So far, the new countertop and sides are in.

Next up is a teak grate in the center and a mortise and tenon frame around it. The plywood was a mockup I used all summer, and was very happy.
It is cavernous inside, and takes the yankee, drifter, spinnaker, and a storm jib with ease. Yes, I get bored easily sailing.

The area with the Plano boxes will get a rack for the boxes and two cubbys forward. Some spring loaded brass tubes will keep the boxes from moving while underway.
At this point, I need to bite the bullet and mill the grate. The maple test pieces came out beautiful, now it's time to make expensive sawdust.