4 X 8 sheets of insulating foam board is light weight, attatches to a wall easily, is inexpensive and gives you a nice surface to stick pins into. 2 pieces is a nice size for laying out bigger bed sized quilts. You just cover it with batting or flannel.
Clear totes are wonderful to be able to see through, but the sunlight probably will fade those in the front if left there for long time frames, some fabrics seem to fade sooner thatn others. A curtain across the shelves can help with that, or maybe DH can make doors for the shelves.