with water falls going into them. It might be neat to even have buildings or tunnel entrances scaling the sides of the cliffs down the sink holes, if that makes any sense. And the citizens could even build big water wheels there to get power for the city... Just a thought.
Doing it in the steampunk style could give everyone the freedom to go more medieval if they chose or make it really clockworky
I like where this is going and the layout look interesting to work with.

I was wondering how big the city will be in term of population and size. From what I can understand from Robbie's map, it's not a big city by modern standards. A city of 25k people could fit in an area of 1 sq km. Of course, we don't have to follow the era standards, I'm just pointing it as a reference.