I'd put the skimmer in and out before the refugium, and your bubble trap before the refugium. Right now you're taking refugium water and skimming it, IMO a no-no, plus you'll be reskimming water by draining the skimmer to a place "upstream" from the skimmer input, plus you'll be effectively adding all the skimmer flow through the refugium and over the bubble traps. Like if your return is 500gph and your skimmer is 500gph, you'll be pushing 1000 gph through the fuge and over the baffles. There's no need for that to happen. Also, I don't understand the configuration of your baffles before the refugium; what's the benefit of that "split wall"? Maybe I just don't understand the drawing.

Anyhow, those are my thoughts. Good luck!