I believe my Mr. Aqua 60x30x36cm rimless is 5mm thick. It might be 6mm but I used some old, un-calibrated callipers to check.
Most people in this hobby will overbuild for peace of mind. Especially for a tank or stand. If I were you, I'd consider getting thicker glass cut and rebuild, just to be safe. In the meantime, you could water test this tank for a few weeks to be certain and then make a judgement call.
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