I tried making a wind screen out of plexy glass that went all the way across the back from roll bar to roll bar. Got a terrible blow around each side of the screen, much worse than without it. I have looked at the BMW screens, they are made of very fine screen material that let the wind that comes around the sides diffuses through the screen. Now I am making plexy glass side window for the wife.
After that I'll try the screen material for the back