One inch board can work well. If you really in your heart think that you need more than that you can always use a bit of epoxy and micro and glue two or more boards) boards together. Blue board is about the same as pink board.
I have used two part foam as a glue to put two boards together. It is very sticky.
You can always try to make a metal frame and cover it with polyester fabric,$1 a yard on ebay. Heat will shrink it if needed.
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“The further a society drifts from the truth, the more it will hate those that speak it.” George Orwell
“Before a standing army can rule, the people must be disarmed; as they are in almost every kingdom in Europe.
The supreme power in America cannot enforce unjust laws by the sword; because the whole body of the people are armed.”
– Noah Webster, 1787
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