Here's my first ever light modifier that I just put together. I only copied others before me, so nothing new here. I'd say the only new and different here is that I used a couple of metal clamps to hold the two panels together rather than the "double C" clips. The clamps work remarkably well. If I want to do anything more to this would be to get some velcro strips to place them in the midpoint of each PVC pipe to stretch the fabrics a bit more.
The view from behind showing the elastic band and the metal clamps holding the two panels together.