I'm late to this.
Assuming nothing can be permanent/fixed, I'd probably make (4) 3' X 5' gobos from 1/2" plywood faced with 4" of OC 703 or Rockwool. Make a cave using the gobos, lay a couple 2X4's over the top, pile on some of the stuff you already have to serve as a roof. You can lay the gobos down sideways against that low back wall to get them out of the way.
Besides the added cost of materials, put in another line item: "Flowers for Wife."
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