I also made one like Terry many years ago. The one in the pictures is my old table of about 20 years ago. Now that I'm older and less able to carry heavy things (metal knees and heart surgery) , I made a new version using 1 X 4 for the perimeter boards to make it lighter, but still very strong (no pictures of this one-but it looks the same except for the 1 X 4 perimeter boards). All of my sheet stock is broken up outside my shop on one of these tables. My shop is too small to do it inside.
On one side of the table (shown in the pictures) I have added two squares of plywood with a screw off center through them and into the table side. Turned one way, they are below the table surface. Turned 180 deg, they extend above the table. To load a sheet, I tip the table on it's side with these plywood pieces down against the driveway, lean the sheet against the table and on these pieces of plywood. Then I bend over and tip the sheet and table back up on it's legs, turn these pieces of plywood 180 deg to drop them below the table surface, and re-position the sheet for cutting. Using a table like this prevents cut pieces from falling as you cut them free. The table sets up and folds easily. I store it leaning against my plywood sheets in my shop.
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You can get the legs from Northern or Harbor Freight for about $20. The table itself is assembled with glue and biscuits, so the only metal in the wood top are the leg attachment screws and the two screws holding the plywood pieces on the one side. All are more than 1" below the top surface, so there is very little chance of ever cutting into them with your saw blade.
My cutting table has doubled as a picnic table on two occasions. I just set it up with a full sheet of plywood and a table cloth on it. It handles the buffet food collection very well, letting my real picnic table and banquet tables serve as the eating places.
Charley