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Another thing to point out with regard to trap thickness....
Coverage area matters a lot, too. If you have a given amount of material to build with, then I'd recommend a combination of 2" panels spaced 2" from the wall at reflection points, and 4" panels across as many corners as possible.
The rear wall should also get some attention, with 4" if not 6" panels.
If you do all this and still have additional material, then you can think about making the corner traps thicker.
Even though a fully-filled corner will outperform a thinner panel straddling the corner, the same amount of material spread out to a greater coverage area in the room often yields better performance still.
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