Had to make a little more room for the babies, so I took some pictures along the way. Not sure how much detail people might be interested in here, so if you have any questions feel free to ask. I build this rack with dado cuts for strength and to make alignment of everything easy. First thing I did was make a table saw sled that let me easily do the 4 repeatable dado cuts to save time. I can post pics of that if anyone is interested. After that, I cut 4x 4x8 sheets of PVC down.
Cut the dados in the sides
Cut the dados in the shelves for dividers
I threw some pvc glue on the first few top and bottom dividers and clamped them together, basically making it a torsion box and hopefully hold everything square and all that.
Fully assembled, added a back panel, which could have heat tape taped to it, added support for casters, added casters. added tubs.