The window is about 25" x 108". I wanted a screen that looked like this:
I designed it in SketchUp, and divided it into 30 or so pieces to cut. The screen is two 1/8" layers stacked on top of each other. The divisions are made at different places in each layer, so that when they are glued to each other, they form one large screen.
Once cut and put in place, it looked like the following. It looks especially good when there is light shining on the other side.