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I’ve successfully dried filament with these Eva Dry packs: https://a.co/d/eBVuUEE
I’m sure a dehydrator would be faster and drier, but I’ve used these to take a roll from printing poorly to printing acceptably in a few days. Just make sure it’s freshly recharged and you put them together in a small airtight container.
That design is asking a lot from wood. You could do it with metal, but wood needs bracing.
Have you considered adding metal L brackets?