I knew I was forgetting something! City Engine! It was this line of thought that got me to buy City Engine in the first place! Thanks Katto! I'll still need to get Illustrator though because the only other way for me imported streets but not enclosed shapes.
Edit, hey Redrobes...where there is thatch can you do roof tiles or wooden planks? Presumably these would be much easier to automatically texture to the slope of the roof?
@Grumbling: Hey that render looks really great, any chance of a more close up version? What did you use to model / render it with? Presumably as you had the vector info you didn't have to use heightmaps but worked off the vector info directly?

