The design wall in the picture can't be for the $3 size. That size is only 28x40. The one in the picture is a lot larger and sits on the floor.

Design wall
 

I also use insulation board a and just covered with warm and natural batting and gorilla tape to the back it is sturdy enough to lean against the wall and blocks stick to it really well. If lm auditioning a border around a big chunk of quilt I sometimes have to put a couple of pins into the board to hold up large segmented pieces. I have a second one that I can put side by side and get a full. 8 feetof design wall. Blocks will also stick over one board and on to the other. They are light enough to move easily

If you look closely, it is sitting on a cutting mat. I imagine that it is sitting on a table, then.

I made a flannel board similar to this when I was teaching and it really works great. Depending on the size of your blocks, you can fit several on there.

I have Warm and Natural over insulation board, too. DSIL put 2 pieces together on a frame and I covered it. I have it hanging on a blank wall. Had W&N on for 15 years but we moved and it got real dirty so we put new W&N on and it is now hanging on my wall again. If the place your curtain is has tracks for a sliding door or if it had doors on hinges, maybe you could use the insulation as doors in place of the curtain.

get yourself a piece of insulation put felt or quilt batting on it. it's light you can move it around . ( Lowes ) make it the size you want.. good luck

I like Kittybug's suggestion. I'd slide it under the bed when not in use.

I use a flat flannel sheet on insulation board. I wish it was double the width, but it’s not to be. I have it standing upright.

I would have to say husbands banded from inspirational, design rooms.
they think differently.
now you have no design wall. sorry to hear this and for you .

My husband has allowed me to get a "Design-a-way" quilt hanger. It is nice because you get to have two design walls at once, when not in use or you need to hide it, it rolls right on up. http://www.design-a-way.com/

I love that idea. Thanks for sharing!