Maybe somebody would have an idea; I don't.
The only thing I've commonly seen that would work well, and be durable, would be corrugated polycarbonate sheets sold by Lowes & Home Depot for skylights and shed roofs -- but that would be translucent, not opaque. Of course, I'm not sure you really want opaque: I've been in outdoor showers made with treated plywood, and they get dark and buggy.
. . . membership updated.
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