Just looking over the plans on that site Daniel...I'm curious how you will keep the humidity up? It looks as though the top of each shelf is just mesh which won't hold any humidity unless of course the whole room is controlled for the environment? I've been making small modifications to my rack, the levels are solid top and bottum. Even though the wood is sealed it seems to still have a negative effect on the humidity in the tubs. Today I put down a layer of stick on tiles top and bottum of one of the levels. I am hoping this will both ease the sliding of the tubs in and out (which it already has) and keep the wood from sucking in any moisture or less escaping the tubs in general. I could just plug some of the holes in the tubs but if the wood is pulling even the slight bit of moisture that is just asking for serious issues that's why I'm starting with the tile.