Looks like 1x2's would work fine. Avoid having to split 2x4s and still get the same effect. Unless your going to have a real person in there. Have them in costume and tell everyone its the ToTer who didn't say thank you.
Painting before assembly will help seal the wood, but if there is tannin or moisture inside it will still crack and bubble. Go with kiln dried if you can get it in the size. Tannin woods may bleed through so you may need a stain blocking primer before your paint top coat. T-111 plywood if famous for this.
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" There could be no doubt of the design of my tormentors. Oh, most unrelenting! Oh, most demoniac of men! 'Death,' I said, 'any death but that of the pit.'"
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