Window shade shroud

Has anyone used window shades to make a shroud? It seems to me that if you mounted four roller shades on the sides of your mirror box, you could just pull them up after assembling the truss - a quick and easy way to deploy a light barrier. If the wind was blowing your scope around, you could lower the shades part way to reduce wind resistance.

Maybe treating it with scotch guard or something similar would protect them from dew.You'd probably want to do this maybe on a monthly basis.Maybe I dont know what I'm talking about but it works great on tents to keep them from leaking.Darrell Hensley