building plans for a 6-shelf rack

[Godzilla78]

This will definitely be nice. Melamine is much cheaper, but also much heavier and a little more difficult to work with than PVC. Keep in mind, Lowes will cut all of the pieces out for you right at the store, which saves a lot of trouble. That way all you have to do is load up the pieces and take them home and assemble them. I would definitely recommend 12" heat tape for adults, though. Heat tape should cover about 1/3 of the tubs...

Yeah, you are right, my tubs are positioned with the tape across the length of the tub, so 6" ends up being ⅓ of tub bottom width. The vast majority of tubs are positioned with the tape across the width of the tub, so 12" would be better in this case. My bad, I was thinking egocentrically about my rack, and not about her rack dimensions.