I got a couple of 1/4" poplar rods and cut them to six 6in. pieces, and also took a 3/4"x3.5" board and cut it to 6" pieces.
I used Elmer's wood glue to adhere the poplar sticks to the wood. It's secure enough to just hammer the glued pieces of wood in place.
My box will hold 5 panels in place. You can throw this thing across a field and it will be fine! They're meant to take a beating in war, after all...
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