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4' is nearly half of my total head from sump to surge. There's no additional holes to drill, but I was concerned about pulling the water out of the overflow box too quickly for the main return tank and surge return to manage. Then again, I should have a higher water level in the tank at all times.
One option was to drill a dedicated overflow hole for the pump feed instead of leaching off the main drain line. That would keep things cleaner.
If anything sticks, there are emergency open drains from the surge to the DT and from the DT to the sump and the sump has a 50 gallon excess capacity to accomodate the surges. I was thinking of adding a backup tank through a higher impedance line to give me even more protection.
The tank is all glass 3/4" and the top is 1/2" plywood and 3/4" foam. I can add a couple more cross-braces.
The concrete foot is between the house framing and the stand framing - no real place for it to chip or break. I can add another 2x4 from the top to the framed bottom.
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