Nice! I love me some DZC and I like what you've done so far.
I'm a Scource and Resistance player, so your Colonials should stay the frak off my darn planet, but they do look good from a distance...
Icing on the cake is the wrecked bus you did though. I think I recognize that model; is it one of those cheap N-scale busses from China? Because I have a set of those as well; they're great scatter terrain (together with loads of equally cheap plastic cars from the same source).
I'm going to nick your idea with the overgrown bus for sure; I was going to rust them up as well, but this is just gold...
Keep it up; I'll be following your progress.