What do you want the sump to do?
If it is for a reef tank, I would do a small skimmer section first, just as large as you need for your skimmer, then a large refugium to grow macro algea, then a small return section for your return pump. I would not do live rock in the sump.
With that large of a sump unless you are flowing thousands of gallons an hour you do not need any bubble traps just a single baffle to hold the water level even in your skimmer section, and an egg crate baffle to keep the macro algea out of the return pump.
Kim