Yah know. For the price of a hollow core door, I can just buy one, lay it over my work bench and use it. The outer perimiter of the bench is perfectly level so I could just clamp the door to the edges. I do have a piece of 1/8" tempered glass over my workbench. Obviously it curves with the bench top. Boy it sure does make cutting monokote easy.
3/16 was a guestimate.