Too bad, I recommend Reverend Insanity (latter parts of the novel)... I also recommend Infinite Mana In The Apocalypse (fast-paced, started pretty early). Maybe they are not directly about world-building, but they are well-written especially the former.
Eh, hey, I don't exactly advice you to read kingdom-building only novels if their author isn't that famous, it requires so much knowledge about business and how the economy works and maybe scientific knowledge. It isn't easy and they may waste your time instead with their obvious plot-holes. However, that's just my two cents.
