Dele16, Have you thought about making a soft top over a frame? I don't have a HMMWV but on my deuce and 5 ton I'm making new soft top from several layers of canvas and on the outside, ballistic nylon. Sandwiched in between the inner layers of canvas, I'm using foam sleeping mats.
The BN is black and so is the canvas I'm using, but I'm fairly sure the rattle can Rustoleum camo will work for color + then some waterproofing. I bought the deep forest green, earth brown and black and waterproofing, but have only experiments on small amount of nylon. It does stiffen some, but even heavy areas did not crack.
The straight lines of the HMMWV windshield seems ideal for stretching from point A to B and C.
I'm making about a 3" "duckbill" overhang on the front (steel attachment) and windows for better attachment and to get the darn water further out and have a drip edge.
The dark color of your beautiful truck with the black nylon would seem to match great with no coloring. Or just a light use of the flat black (the camo has a bit of blue I think) to take the sheen off the BN.