Commercial panels use sheet of plywood on back side, stuffed absorber inside frame, covered with fabric which is stapled to the plywood on the back. That looks nice enough if hang right on the wall.I have all the panels built. Now I'm needing some type of material for the 703 covers. Brown, black or tan preferred. The 703 will be nested inside the frames. What is the best way to go about this? I can put ridge caps across the front with the material between the frame and cap. Wrapping the 703 and sticking it in the frames with burlap doesn't look or work very well. Ideas?