Ooo, more great stuff! ::rubbing hands together happily:: I'm so excited to see you working on this. You go into some good details involving the underlying structure of a city. Very helpful.

Typos! Alas, there's one on your very lovely cover. You've swapped the places of the G and the T in "Cartographers'." Oops. (Or does this mean we're now some kind of fancy cargo movers? )

Page 17: I'm not sure what to make of this sentence:

Cities are rarely composed of a uniform set of buildings each of about the same size, shape surrounding public space, colour and decoration.

The whole first paragraph on that page could use some serious attention. :-/ The other errors I saw were minor. If you'd like, I'd be happy to proof all your text...