You can use plywood and if you want to get fancy, can use oak. Pretty much any hardwood is fine but like i said, most people just use plywood and then seal it with a marine grade waterproof sealer. As for foam, I've seen guys do fancy setups for beardies with rock steps and all that stuff. I dont remember exactly what they used but it wasnt anything fancy. Does a take long time as they had to layer it to build up the strength on it. But i would imagine most stuff is fine as long as you let it dry and cure fully since you would be sealing everything with the marine grade sealer so nothing soaks up urine or moisture and falls apart.
A lot of people also used Melamine but that stuff weighs a ton and you have to be sure to seal the exposed edges as its pretty much just particle board with laminate on it. So if any moisture gets into the core, it will rot.
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