May help with graphics / images / pics.
But first, it could be good to think a bit more about the city general look.
It's close to sea? has a river? mountains / hills?
I was thinking to keep it as close to the current one as I could. So at the water's edge,with a central hill. behind that, in the part of the city not show on the current map I was going to put the keep, and then the docs on the secton of coastline currently visible, with shambletown sprawling between the south gate and the docks.
Middle Ages city model? European-Gothic town? Arabic kasbah?
Think of cities featured in films, or imaginary cities in games. TES III Morrowind towns and cities were interesting.
I was thinking Middle Ages for the plebs, and moving more toward classical/renaissance styles for the posh end of town. A little bit of Early Industrial Squalid might work, too.
Then draw a sketch, develop some history remarks (history affects town growing and shape, adds flavour just like ward names) and make someone draw properly a plan at 1200x1200.
I did a bit about Crossgate's history as I see it in the Nature of Crossgate thread. Short version: the city is there almost entirely becuase the area is prone to spatial anomalies, portals, and the like, and a lot of what gets deposited by these things is worth money. Most of Crossgate's trade began shipping alien artifacts and slaves, and it's still a major slave trading city.
Other than that, the place is too far out from the capital to get much attention, and by and large it's a nasty, dangerous place to live. The post of city governor has become something of a punishement posting at Court, and the city's had a sucession of governors who hated and neglected the place, which is why the gang problem has grown so badly out of hand.