Gobo Construction

[VSpaceBoy]

I don't have any experience with gobos at all but I do know that my room for vocals right now sucks, So I was going to build a Gobo. Originally I was thinking: 1/2" plywood or particle board for the back, 1x8 trim for the frame and stuffed with two layers of 4" batt insulation, trimmed in cloth.

I have been thinking though... Since I am only going to be using this to sound treat for singing, could I get away with using much lighter materials?? I work for a building company and we use ThermoPly for exterior shelthing and I though that might work well. Is very rigid and only like 1/4" think and very lightweight. Use that for the back, maybe use two or three layers of it cut down and glued for the frame and then stuff it with the same insulation. I could probably get away with a thick cloth hinge all the way down the sides.

Any thoughts from the more experienced??

SpaceBoy