If you make the GI helmet, please post it. It might be useful to zip all your GI kit abovementioned together in one zip file so people can download it all in one click. I made my helmet model by measuring a real one (a plastic film prop copy) and writing a Gnu C++ program to output the .OBJ mesh file complete with uv lines. To get the shape right, I waited until the sun was low and used it to project the helmet against a door and traced the shadow on a piece of paper.