Yes I agree I would have an acrylic over flow box built around your overflow drains. (I think OA can do this for you)
something to consider. The stand seems fairly low. you may find you have difficulty finding things hat can fit under it, Like a skimmer. I know you have invested a lot of time into the stand but I would raise it. It could also just be the perspective of the image.
As for sump/Fug I would baffle the refugium so that water from the overflow drains into the baffle then through the Fug then into the sump and returned to the tank. This will elliminate any bubbles returning to the main tank. Also you will not have to worry about the return pump sucking anything from the Fug into the display or clogging the return pump
J
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