I just had to try this. Of course I have no $$ for sign board so I just used cardboard. Went to grocery store & asked for cardboard.They gave me lots of heavy duty cardboard, which I cut into 7.5x11.5 pieces. Had lots of 4x11.5 pieces left. Couldn't just toss my free cardboard, so I used those for my less than a meter cuts (seems I have lots). May have to rethink that when I get another car load of boxes. The fabric covered chair was really helpful. So far I have three shelves onto two. Still lots of room on second shelf.
Trudy