well, ambition wouldn't wait for funding, so I went ahead and used the existing panels until I get $$$ and time to use all the ideas you guys provided. I did get some good insight on installation though, and pre-planning and careful preparation are invaluable. In addition, those existing panels are unbelievably tough. They are much stouter than just cardboard, and I found out a Skilsaw comes it handy to make the cuts. I'll post pics in the next day or so of the completed installation, but the sound is 100% better. Thanks to all who posted; I'd have never come up with a fraction of the suggestions y'all offered.