Your sump is about 100 gallons, a quick volume calculation shows that if your baffle compartments are all full, you'll be around 65 gallons. That leaves you 35 gallons to spare, so it would depend on how much will drain from your tank when the pump is off.
That depends on a few different factors - how much will flow out of your overflow before it stops, and how much will get siphoned from the return line before it breaks siphon.
Additionally - its probably inconsequential, but if you use 0.22 inch thick acrylic for the baffles, that will take out 1.76 inches out of whatever you glue last if you don't account for it.
