Hey it looks like it'll work. I used two ugly heavy pain in the ass 1'Wx4'Lx3'H fifty gallon aquarium tanks as res's once, roots didn't give a shit! With that black skirt, kind of looks like the roll of black/white poly i have. I've been envisioning a huge res made of nothing but b/w poly dropped into a PVC frame. Both items are cheap as shit, especially so for the sq footage you end up with. I've gotten all origami like with PVC and poly separately, but never combined the two, you can really fold it nicely to make a sharp looking cube, probably any shape you'd want, same goes for building a frame with PVC, no limitations on size or shape. Something to ponder when you're drawing up plans for the next res.
EDIT:
Actually,.. maybe take it a step further, and run water through the PVC frame to misters using some of these,.
PN RTT418 - 1/2"S X 1/2"S X 1/8" FPT PVC MISTING NOZZLE TEE's.
Endless configuration possibilities.