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as for the thread, bad choice of where to drill it coupled with an unsupported bottom. all that don't support a tank with trim is bunk if you use a foam that will take out the irregularities it only adds to the strength and resistance to cracking.
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Those are my thoughts as well. Regardless of how the connections are configured, the bottom pane supports the vertical load and the sides hold the water laterally. I can't see how a foam insert below the bottom pane would
not be a benefit. What is supposedly happening with the forces in the opposite scenario?
But yeah, just about the worst place to drill the bottom pane, right in the middle...