I've long contemplated doing this myself. I'd like to make something like the wood test tube "pen racks," but for ink (and, obviously, on a larger scale). The problem, thus far, has been one that would look right with the various bottle sizes.
I suppose one rack could be made to acceptably hold Waterman, PR, Diamine, new Skrip, etc. Taller, more slender racks may be in order for Noodler's, old Skrip, etc.
I'll be watching curiously, I'd love to get ideas if anyone has something.