I’ve been looking around at these options too. You could do an epoxy resin sealer? Like you would use on a wooden bar top. Coat every panel of the cage then assemble and caulk the seams to make it totally waterproof. Melamine would be the faster build but I agree, it’s just crappy particle board with a slick veneer. If/when I do build a big cage I’m going for cabinet grade plywood probably birch or maple with a light ebony stain and seal with a yet to be determined finish.
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