Looking good Torq.
First, a question. I thought the map had to be at least 1280x1024?
Second, a suggestion. When you do add in the ground level, to really pull off a depth illusion, be sure to make it in different layers in Photoshop. Then blur each layer differently. The idea is this: objects farther from the focal plane (in this case the tower tops) will be more out of focus. So a tree top will be less blurry than a bush on the ground.