Regarding a design wall==I'm a little behind on my reading and answering you. Chemo got in the way. But when I went to a quilt retreat, the hostess hung a flannel backed table cloth on her wall. Used painters tape to attach it. Covered her closet door with it also and it didn't hurt it at all. Sure wished I had seen this before bought the material for a solid design wall. When you are through for the day you can leave it up or take it down and fold it up for the next time.
Ellie