The irregular shape of the city was to give it a less grid-like look, which was not really applicable to ancient Tamna for geographical and geomantic reasons; this one in particular was arranged to somewhat mimic the constellation Ursa Major as was the case in 6th century Jeju City.
Anyway, I've been thinking about how to do a new Chinese city set based on the layout of Tang Dynasty era Luoyang, but I'm still in the process of new experimenting with creating roofs.
Intriguing on both counts - can't wait to see your Luoyang.
Best,
Oz