First thing is to start with the adjustable window screens you buy at a home improvement store. The screens slide to open wider so you get 2 screens to work with when taken apart.
The clip (upper right picture) comes off easily to separate the screens.
Next you remove the white plastic corner brace from a single screen. This makes it easy to remove the black vinyl cording which holds the screen in place.
Using a spine tool (around $3 at home improvement store), lay the vinyl back in the groove to hold fabric in place and run the tool over the vinyl cord. It will sink into the groove on the screen to hold the fabric in place.
You finish by adding a "well" which is an extra piece of tape at the top. You do this on one end only and usually where you begin your pull for screening an image. However, wherever you choose to put it, tape the underneath side as well in the same place, lining up the edges. The well holds the paint you want to pull over the screen.
Thanks to Denny for this wonderful and innovative idea. More to come on using these wonderful screens.