Here is a quick model I made up to illustrate a stick frame with thin pieces for the shelves. The top & sides are 1/2" wood (oak or pine etc.) the interior frame would be 2x2's and the shelves would be whatever. It's similar to the other good ideas. It may need something on the bottom of the shelves to keep the critters from crawling out of the tub on to the shelf but that could be thin material also.
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If there is anything the nonconformist hates worse than a conformist, it's another nonconformist who doesn't conform to the prevailing standard of nonconformity.
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