I love your idea! Design walls or design boards are the bomb! I found a cheap pc of board where a new home was being built. I asked if it was trash & they said it was. So I asked if I could have that 1 pc of maybe 20 inch square. Sure take it! So I did and covered that with some batting & felt & I have that propped in a chair beside my machine to put blocks or block pcs on.I love it. So even a sm pc of cardboard would make a great sm sz design board.