I ended up ordering some auralex products (the sonoflat & sonofiber) and will post when I have them installed. I thought about making some, but it was just too easy to buy them ready made. I also got one sheet of 2x4 studiofoam from a local music store. I hope I did the right thing in ordering more rigid products. I guess I'll know if I may the right choice in about a week when the panels show up.