>>Awesome rack!!! What size containers did you use? Do you not use the lids with this design? I was thinking of building something similar, but I am wondering if I can use heat tape on the bottom? I don't know if sliding it in and out will damage the tape.
BTW, here's a tip for anyone thinking of using heat tape on the bottom of a cage like this: I did this one the first rack I built. Because of the tight tolerances, the tubs were always catching the front edge of the heat tape and tearing it up. So I went down to the local home improvement store and bought some thin sheet metal. I forget the exact thickness, but it was pretty thin an bendable. I bought sheets that were as big as my shelves, put them over the heat tape, and secured them with a few screws. It works great! No lip for the boxes to catch on and the metal helps spread the heat, too!