Here is the map within SketchUp and what I will be using as a template. What I don't like, so far, is that there isn't a way (that I have found) to map an image to a viewport and model from that the way 3D Studio MAX does. With SketchUp, I had to map the image to a stretched cube. Then, I deleted the rest of the sides and back to make a plane.
I converted the textured plane to a component so I could model on top of it and not affect it.
Here is the plane with a few buildings in process. The buildings aren't to scale yet, as I didn't do my research there. It was trivial to trace the buildings and Push/Pull them up. Once I do my first round, I'll probably go back and refine the drawings, and then texture them.