Hey Vert,
What scale are you working with? I did a diarama of a 1/48 scale Hellcat parked near
a runway and I used Cheesecloth I painted Khaki. Do a dry fit first to get an approx
fit. then either spray or brush paint the piece on Wax paper and fit damp to the frame
of the shelter. I'm not sure what you should do if you're fitting it right onto your model.