The one I’m looking at is appx 20″ long and 8.5″ wide. It uses the foam/rubber inserts to “block” off the unused portions. I’m thinking though that with that much surface area on a larger board, it would still be plenty. As in the video Berry linked, he lifted that large board with what looked to be no more than a 10×10″ vacuum plate.
Plus I could move it around the main table as needed since I wont be permantly mounting the vac plate. >>> Yes, I am talking myself into it 🙂 <<<