Just built this last night.

It holds 32 lab tubs (16 on each side). They go in sideways. It's made with 1/4 in hardware cloth and the food goes right on top in a little sectioned off area.

There are only tubs in every other level right now because there are water bottles in there right now (I'm making an order for valves from reptile basics this friday).

Pretty sturdy. Only think I want to change is adding wheels.