One thing I love about all this DIY stuff is how it seems to reinvent itself, often with no effort on my part. While pondering solutions for echoing "live" rooms (ones with lots of sound reflection), I thought of a way to use existing pieces in the PVC light stand kit to hang a sound blanket. Most people use moving blankets to absorb wayward sound waves, but I didn't have any, so I used the thickest blankets I could find.
This setup involved a maxing out of the light stand's stability. After adding three 2' lengths for a total height of 6', I added the third stabilizer leg (mentioned in the original video) as well as a third foot. At the top of the stand I added a 3/4" t-joint and plugged a 2' length into each end. This provides a perfect hanger for the blankets, which usually span 4' in width. Finally, I added a 10lb. leg weight to each stand, to keep it from tipping over.
Now comes the hard part. Where to hang these blankets in a boomy room can be a real challenge. The general consensus is that you get as much absorption (the blankets) or diffusion (a stack of crates) in the way of the incoming dialogue, typically behind the camera. Experimentation should give some usable results. I'm just glad I now have a practical way to hang blankets, which was always a question mark.