It is indeed a standard jeep windshield cover. Note that with the bottom stretcher in place, the windshield would not fold up. As to the sign on the cover, it looks like some sort of air recognition symbol, but doesn't seem like it's a red cross... but it's not a standard on windshield covers, so you're probably free to interpret it as you see fit.
Your modelling project... it isn't 1:1 scale, is it?
I think it would be great to build one of these out of an old jeep wreck...