We made a mold using MDF/particle board with a smooth white laminate-type finish. It came from Lowe's, and is similar to melamine. Others in the forum have used it. A 4'X8'X 3/4" sheet is really heavy, but it is very dimensionally stable if kept dry and properly supported (we used 2X4s on the "other" side). Sorry, I can't find images of the mold. Good luck!
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