Hi Chris,
Try searching for sump or fuge or sump/fuge in the DIY forum. You should find some examples there. You're also welcome to stop by and take a look at mine. I had very limited space in my stand, so I'm using a 15g tank with about 1/3 of it as a fuge on the right, a drain and skimmer section on the left, and a return pump section in the middle. There are three baffles between the skimmer and return to trap bubbles.
I'd be happy to talk about your design with you and share ideas.
What equipment do you hope to fit in the sump? How are you draining water from the display?