Cross braces from corner to corner? Or from mid-point on each side? The screen is in front of a window I blacked out with 4 mil black plastic. I think it is 50/50 cotton/poly.
I am concerned that the cross braces will show through the fabric. Would it make sense to paint it? I would have gone with blackout fabric, but the largest width I could find was 54", which is about 6" too narrow for 4:3 images.