[I just got off the phone with that member, and he's got a cool plan for this overflow divider. Basically, he's putting a pump in the base, and plumbing it up to a SCWD which splits to two returns, making a closed loop. The Remora skimmer will be a HOT unit, but behind this partition so it won't be visible from the tank. And he's planning on putting his heater in there as well.
So the entire box is designed to hide everthing, leaving the tank for beauty only. I hope his plan works.]