(Total Aside:
If there are flying ships, why are there bridges? Wouldn't there be flying carts and wagons as well? In fact, why are there even roads? I could imagine people just "landing" their wagons/carts/ships right on top of their houses, or mooring them to large posts that stick up from their homes.

If that were the case, the roads would really be more like sidewalks or paths.)

Yes, I agree about the big rectangle (square) in the middle that seems odd. Also, without knowing more about the technology of the setting I couldn't recommend too much regarding the roads. Did they actually "make" the roads, or are they natural paths that have been created over time? If they are more organic, I would say drop the roads, plop down the buildings where they would most likely have been constructed, and then allow the space between them to be the roads.