I have bought a couple different solutions, but nothing really works "perfectly", Either they take too much space from the workbench, or they don't hold enough bottles. I now have paint from about 12 different brands and lines, for different applications... Over 250 bottles stored in various places on the bench. I need a mansion for this to be perfect.
My perfect room would have 3 wall benches, and room for a conference table in the middle, with 1 side dedicated to building, one to painting and one for "other". The conference table would be for having friends over for build nights.
I'd have a paint booth vented through the wall, and wide enough to fit a large 32nd model. and deep enough to be able to do the same. but alas... have to win the lotto first.