Here's an updated sump design. It has a smaller skimmer section and much larger return section. Approx volume of the drain/skimmer section is 15 gallons. Approx volume of the return section is 21 gallons at normal operating water level. Total volume of the sump is about 70 gallons. I will still add a bubble chamber for the return from the remote refugium. Still debating on how to do that.
What do you think about the 4" baffle at the bottom of the drain section? Do you think it would trap detritus before the skimmer? The sump will be constructed out of 3/8" acrylite acrylic. Do you think it needs a rim around the top?