Bob, could you with clay, yes, would you want to, maybe not. Plaster, foam, drywall, wood, masonitw can all be used to make a portal. There are so many good portals out there, why not buy one? Save the time for the things you cannot find or are too pricy for the budget. There are all kinds of rollers out there for making just about any surface you might want out of clay. There are even foam rollers.
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