Thanks, Don!
I can tell you this is heavier than I wanted it to be. My original plan was to have it store on runners or hang directly under the table saw extension but I decided to make it the same size as the extension top so that was out. When I picked it up the first time I knew the only place to store it would be standing up against the garage door. I also thought about getting some pulleys and hanging it directly above the extension by pulling it all the way to the ceiling. But I just made the Walnut/Maple handles and will tote it back and forth.
If I were to make another one I would look at 1/4" or 3/16" hardboard with solid wood internal frame, maybe 3/4" x 3/4" sticks. That might take a little while longer to make but would probably be half the weight.