Those look great! I have a few quick question's for you, I notice you're using XPVC and I used it myself to make my 28 quart tub racks but my 41 quart rack I bought. The 41 is a traditional pull from the front design but I had thought of building one where the tubs slide out sideways just like the one you posted here. Have you noticed any sagging in the center of the shelves, the XPVC has some flex to it so I'm curious. Also did you cut them from 4x8' sheets? If so did you need 2 or 3 sheets to do it?