I actually intend to just build a 3 sided box around the Protein Skimmer, siliconed into the sump just right of center against the bottom, with baffles opposite the backwall of the sump. The skimmer compartment will be the center section of the sump with nearly half the space (the left end) for refugium...I will make a perforated plate to extend the wall of the skimmer box...This along with the box will contain the refugium.....the outer baffle of the skimmer box along with the front wall of the sump will make a channel for the fuge water to the other end of the sump where a compartment will make room for the pump suction bulkhead and a screen for it and another bulkhead with a ball valve to a hose for water changes...The fuge will have one pipe of the overflow piping and the skimmer box will have the other pipe....there will be plenty of room in the pump chamber for heaters, probes, float switches for ATO (run by the Apex)...should be pretty sweet and easy to make at the same time!!!! The design will have part of the water being skimmed, part being fuged and all of it mixing at the pump area....