That was brilliant Airbrush! What a cool idea. I know for 1/35 I've made barbed wire by streching wire between the arms of my spare hands jig and tied either wire or thread in intervals, touched glue to it and trimmed it to size and then moved along to the next section. Your way seems infinitely easier.
As for shingles, I fear I'm old school. I make the shingles from really thin balsa wood. But I cheat making sections of 3-4 and then staggering them. The overall effect looks pretty good but under close scrutiny you can tell. I wet the wood so it warps a little and the result is "ye olde european or country style shingled roof" The rest is paint and weathering like I would do on a model.
As for weathering buildngs etc. That dependent on the environment the scene is in. (Not much I know, but the land mass of europe and North america are pretty big, so I would look at photos and match the environment)
Mike
Mike
"Imagination is the dye that colors our lives"
Marcus Aurellius
A good friend will come and bail you out of jail...but, a true friend will be sitting next to you saying, "Damn...that was fun!"