Panel Framing Question

I'm thinking of building a frame by using corner bead. A 12ft long corner bead would give me a 2ft X 4ft rectangular frame. Two of these frames are riveted together at the corners by short (3" for HF, 6" for LF) pieces of corner bead, with Roxul's Safe'N'Sound sandwiched in-between. I could then pull a burlap cover over the whole thing. Bad idea? I think David French has a short mention of corner bead, but there are no details in his post from 2006. Please advise, I've yet to build my first trap ;)

If you can get the frame to be somewhat solid and hold its shape, it will be fine. You don't need much in the way of structural support for these frames.

Thanks, jwl! I guess I didn't look hard enough, there's a bunch of references to corner bead on musicplayer forums. Here's exactly what I had in mind: http://www.radford.edu/~shelm/acoustics/bass-traps.html Thanks again - ardo.