That would be fine. I typically have lots of suggestions when someone else is doing all the manual labor.
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Why not just fiberglass it? Instead of trying all these funky wood working skills? Fill it with shipping peanuts till you get your cubic feet & boom boom your done! Well it's a little bit more work but yeah...
Because you would have to layer up about 3/8" thick fiberglass matt and resin to have the same rigidity as 0.75" lumber, and that is a royal pain. A couple of layers of resin impregnated fleece is okay for a midrange pod but just doesn't cut it for a sub enclosure.