Makes sense. So these are rack shelves? How big?



If these are more or less regular sized rack levels then I have a couple of other ideas for you to consider.



First, instead of using two entire 1/4" pieces consider using just one full sized 1/4" piece, or even 3/8", and then use strips of 1/8" material to create runners for the boxes to slide on. These can either go over the flexwatt or just on the outside of it. The latter would be easier and preferable, but it depends on how big each shelf will be.



Take a look at this rack, specifically at the white shelf, second from the bottom.







The two brown strips are 1/8" hardboard that I placed over the melamine shelf for the box to run on. In your case you could use 1/8" PVCX scrap for the runners and solvent weld it right to each shelf.



Another idea is to build the entire rack out of 1/4" material but instead of having the boxes slide on the shelves, like a typical rack, have the lip of the box slide on PVC angle solvent welded to the sides of the rack. The nice thing about this design is that you have room underneath each box for heat tape and don't have to worry about the tight tolerances normally required by a rack. And it also transfers the weight of the boxes to the sides of the rack rather than each shelf, which makes the potential for the PVCX to sag less of an issue.



But this design requires a box that can hang from the lip around the top.
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Currently keeping a small collection of various Gonyosoma. Both G. janseni and G. oxycephala.

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