Okay then , I had a couple of PM's in regards to the panel construction/703 saga, so I thought I'd post a bit more of my process here to hopefully assist those who may be interested...
Tonight I finished up another 6 panels, and took some pics to show some of the guts of them. Here is a 21"x48" panel frame - cut down from 2x6 KD Spruce from the lumberyard into 2"x1.5" pieces:
You'll note that the ends aren't beveled yet - once I brad/glue them, then I bevel the remaining portion while my table saw is still at 45:
I end up with a decent cut that's fairly close, and sand off whatever might affect the lines that show under the fabric:
Here, I'm fixing to finish up my two ceiling 'cloud' panels for the centre channel reflections
A gazillion 18ga crown staples later, the Expo Cloth is stretched and secured
The OC 703, I rip down to 18" inside width for the frames by using the tablesaw, goggles, and a 3M respirator (safety first!!), and friction fit it into the frames. I left the backs of the 703 open, as the mounting was flush to the wall/celing and I felt that fiberglass won't be escaping from the fabric seal around the back edges of the frames
Now seeing as I'm using a cleat system to secure them to the walls, ceilings, I ripped down some more spruce on 45's, and secure it inside the frame like this - with a cutout of 703 so that the receiving end can catch on the lip
For the ceilings, I added three small metal tabs screwed to the frames to take the weight and secure the opposite ends. All were screwed in with heavy duty drywall anchors if I didn't luck out and hit a joist....
Onto the finished product......