I wouldn't have the second baffle go to the top of the tank, just an inch or two higher than the first and third baffles. When the return pump gets shut off the water from the display tank will continue to flow into the sump until it is below your overflow so you will want as much space in the sump as possible to accomadate the water so you don't end up with a flood. Also test fit the skimmer before you seal in the first baffle.
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