Cool idea.
Indoor or out?
I have built a kitchen counter top out of
wood scraps, with nylon window screen stapled to it.
I finished in fiber cement and hydro stop cement.
It's held up very well with constant moisture, but its never been underwater.
I recommend wood to support a wire and mesh form, because its cheaper and easier to work with and it can easily be finished in water resistant materials for longevity.
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