Most woodworkers can always use some extra bench area. By making this portable work surface, you’ll be able to quickly convert your table saw into a handy workbench when you need additional room for light assembly and finishing work. Use 1/2-inch thick plywood, cutting it to overhang the saw table by a few inches all around. The cleats serve to help position the top while preventing it from sliding if bumped. When the work surface is not needed, a hole in one corner makes it easy to hang.
– Jack Bruce