Tank is full, sump is up and running and everything seems to be going smoothly! Did have to purchase two new washer as there were a few drips, but that was an easy fix. Did a power loss test and cut the return pump; let it all drain back into the sump and had a good amount of room left. Just need to figure out how to tie in the ato and where to put it.
Looking better and better as everything gets up and running. All that's really left is to hang the lights and then figure out how I'll cover the stand / add doors. And clean everything up, of course

Question with the sump. Does it matter where the heater goes? Is one chamber better than the other?