I was so confused for a second when I was first looking at this and thinking "Building horizontal seems like it would be a bit inefficient for a rack" then I saw the shelves and got even more concerned. Then I realized that I'm an idiot. WHOOPS.

Anyway, looks fantastic! If this thread had existed before I ordered my AP rack then I may have gone in a different direction. Maybe I'll borrow your design for when I get around to building some hatchling tubs and make it a baby center.