dunno where you got the idea, but I wouldnt do a scrog in a tub. this way you wont have sufficient air flow and you cant reach most of your plant, so you can expect problem with pests, mold etc.
nice plants. they look great. awesome setup as well. keep it simple stupid. if you cover the cooler though, air flow will not be good enough
damn, I really dont get why people put a layer of stuff at the bottom that doesnt feed the roots... if it doesnt air-prune them, I cant see that being productive.
youre not gonna be able to get in up under that bitch to trim, feed or water or anything you need at least a few inches between
If you could drill a square out you could put a small pc fan (away from potential water) so it's always moving air underneath! That would be a perfectly simple solution to air flow down there