OMG I didn't visited this forum for a very long, I couldn't believe your project was still in progress, I remember the first steps rendered with kerkythea many years ago... your dedication is impressive to me, congrats!
How do you manage such a big model? I guess there are a simplified basis and more than one file for the detailed buildings
Replying to one's own thread is usually bad form but I must say I really REALLY like SketchFab.
Since I originally posted this I've added a load more models, have a look: https://sketchfab.com/dma-ni/models