Update:
I went mad and did a some CS work on the exterior cells. They're almost complete and n the process I came to a conclusion - there's no way I'm logging the positions and rotations of the thousands of meshes in there so its not going to be buildable but there will be outpost building missions. They're like small airship docking posts in the seas of Vv that the player can build. The city is just too big now. Now I just have to figure out how a huge city was built/appeared overnight . Here's some screenies:
First Excelent City And AWESOME Airship designs!!!.... I{ve been reading the tread today and seems to be coming in nicely.... I{ve an idea what if the city emerges from the underground...., I mean example you hear rumors about dwemer spires emerging from the earth on some place (that may be a good aproach for the player into the quest/s) and that you may actually se one or to emerge while arribing there you know a script to rise tha spires based on time and some dust fire and lava activators well placed could do the trick... althoug it may require the city design to be adapted to look like something that could grow out of the soil... Hope you like it all in all I allways though the dwemer more prone to dig tunels set up an underground facility and have its spires to break out on the surface as a way of safe sudden colonisation of a new territory