Actually the green Lowes board is Kingspan not Dow...Dow is blue. Pink is Owens Corning Foamular. Both are extruded polystyrene... and essentially the same for our purposes. I would look into Polyisocyanurate board for scenery. Its messy, BUT imminently more wore workable. You can shape by abrasion (with a pencil!) and its available in HUGE blocks. You might look into insulation distributors to see if the carry/fabricate the polyiso product.
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