I realize the photos don’t show the joinery, but it’s really simple. I used double rabbet joints, then glued and screwed. The frame is 36”w x 60”l, with a 3/4” plywood top. The top overhangs 2” all the way around. The bottom shelf is 3/8 plywood.
I will probably add another 3/4” layer of something over the top at some point but it works for now. It also serves as an outfeed table.