You could cover a piece of foam core with cotton batting and hang it on the door the same way (sew some loops to the batting or use pop top pulls to add hangers to the piece. It would be much lighter and could be hung to the door using command strips hooks. I'm thinking I need to do the same thing because my usual design "wall" is to spread things out on the guest bed, where the new kitty promptly rearranges according to her superior design inclinations.