I think people already pointed you to Fran Guidry's hombrew music site. He has demos of building cheap panels, and has a demo of using as little as two panels to create a local space.
Btw, my room was 13x15 with concrete floors and sheetrock walls, so your starting place is probably a lot like mine. I have the equvalent of about 30 panels as well as some corner traps to tame my space.
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