Very interesting tank shape! I'll definitely be following this thread too.
Btw, are you using the IKEA LINNMON / ADILS series table and legs combination? Not sure if you are aware, but from my experience with those table tops, due to their lack of underframe, they will naturally start sagging over time (even without any weight put on them), and the corners where the legs are bolted on will start popping up too. Although your tank water volume is spread across a larger area, over time the sagging table top may create undue stress on the long base length of the tank's glass.
Perhaps consider changing the table to the IKEA GALANT series table instead, costs more but it uses much stronger table tops which are supported with full metal underframes, so it'll not sag over time.
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