Considering it's considered suitable for a room of stout construction, it would be interesting to see if they would approve of a dual layer of 18mm ply with a section of the compliant 65x65x5mm unaltered mesh sandwiched in the middle. That means it's resistant against attack by saws and the like (unless the crims were lucky enough to flog one with one of those new fangled screeching chop anything blades)...
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