The following link has a listing of the major cities in SWG and when you go to each city link, you'll find some great screenshots of various areas in the city. You'll also see an overhead map that shows the city layout in pretty good detail. Here's the link: http://swg.allakhazam.com/db/cities.html (http://swg.allakhazam.com/db/cities.html)
Hope to see some maps being made from these references soon. :D
That's a great mapper's resource and will really help with every aspect of design.