Nomad, just looking through the thread again and there's a couple of things I thought I would mention. I am not sure if you are aware, but in diorama building there are a few 'rules' that someone came up with many years ago. One of these is that nothing should be parallel with the edge of the base. So where you have your street coming from the back to the front, the rules say this should be at an angle.
Now personally, I don't quite get all this 'rule'. In the past I have built dio's that are parallel and I think they work fine. But in the last few years I have made an effort to conform to the 'rule' and they do look better, but if I felt it warranted it, I would break the 'rule' in the future. Just something to think about for future builds.
Another of the rules is that the scene should be balanced but not symmetrical. So with the scene your doing, you could perhaps make one of the buildings just a pile of rubble. Are you planning on adding a vehicle.