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In the description of my oven set-up above, it is not explicit that the mold flange is also vertical, to receive the hot sheet with a minimum of fuss and delay. When I was in the biz, we made our oven from sheet asbestos and aluminum angle extrusions. Now, you'd get 'glass reinforced sheets of concrete instead, but I think that drywall and corner bead would do the job well enough.
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