I like the concept and subject. I've wanted to do something like this, for some time. I was thinking about making a rusty, partially snow covered, abandoned tank, in a European setting. I think it might be fun to make one in every type of environment, as well. Obviously, humidity and vegetation cover, would vary from place to place, affecting the appearance and rate of decay. A tank under tree cover might not be as faded, etc. I'd assume tanks, in some parts of Africa, would experience almost no moisture...possibly more paint fading, than rusting. Anyway, just a few thoughts. Looking forward to seeing more of your project!