I may be stating the obvious but you also want to make sure you account for your transit volume, which is how much of your tank will drain into the sump in a power outage (unless you're using check valves, which many people recommend against). I ended up doing a spreadsheet to figure out how to maximize and get as much fuge volume as possible without using all my transit volume space, haha, that was overboard. Then after ordering all the cut glass I changed my mind and went baffle-less, as I didn't want to limit myself. I just built an eggcrate basket for my microalgae, a big rubbermaid container for DSB, an eggcrate platform for my skimmer, and threw everything into the sump roughly in sequence. Of course you can't get perfect inline water flow through all sections, but I love the fact that I can do huge/fast water changes completely from my sump without screwing around with baffles. Just a thought.