I'd expect that the layer height would be closer to 30' than 40'. Also, I'd say that none of the districts would likely span all the layers, and most would only be 5 layers or less (with a few larger ones like Necropolis). Also I take it you didn't factor in the caverns? Anyways, pre-city geography could be useful, but likely isn't that important in most cases as the city has likely overridden most of it by now.

As for the short story, that would be quite the opposite of bad.

Owrtho