Thanks for bringing this option back to our attention Andy. One of my frame building class students (who was a retired engineer) did make a full size epoxy table from materials he bought at Home Depot. When I last checked a gallon of this this kind of epoxy cost a bit more than $100 a gallon. He put MDF board on top of wood legs and sides. I never saw the table myself but he reported it worked great. I've heard that the epoxy will lip up a bit on the edges (there needs to be a fence around the top so the liquid epoxy stays there before it hardens) but that shouldn't have much if any effect on its function. I think he said the total cost was less than $400. I would assume a post could be attached to the MDF board before the epoxy was poured.

Wolverine Bronze company reported to me that their business of making aluminum cast bases has greatly declined because of the increase in use of poured epoxy. My impression for the reason more beginning frame builders haven't used an epoxy poured alignment table is because no one that has done this has reported about it on a frame building forum.