I toyed with the idea of using runners somewhat like what you described but the trouble is the size of the rack. The tubs are 44"x 28" so the shelves are pretty substantial. In addition I need two feet of 11" flexwatt to sufficiently heat each level run side by side rather than end to end. I've actually already built a rack for these tubs but It was from 7/16" polyethylene and the shelves/ walls sag a bit. That's why the new one will be PVC. I may even need to make the shelves thicker to keep them rigid but I'm hoping 1/2" will be enough. AP makes a rack for the Iris VE175 tubs that actually covers a little bit more of a distance than what I'm using and 1/2 CDPVC works for them without sagging... so I'm hoping it will work on mine too. I just think that a 1/2" shelf with the flexwatt right in the middle of it would be nice and clean looking... if it will be strong enough that is.

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