[BillM]

Looking good! I don't see those white lines you are talking about.

I hope you do a map soon. If you don't want to see your buildings in it, there is an easy way to do it if your city is flat.
a) select "Top" from Camera/Standard Views
b) zoom down till you are just a few feet above the ground
c) select "Parallel Projection" from Camera
d) zoom out to get desired view