Wouldn't it be logical to make Aztecs into Lizardmen seeing as the Lizard men are completely based off of the Aztecs. I don't know wheather it would make a difference but perhaps that way the cities would match lizardmen cities.
Lizardmen
http://www.itarsworkshop.com/images/...Temple%202.jpg
Aztecs
http://www.raphaelk.co.uk/web%20pics...scriptions.JPG

I'm seeing some sort of resemblance here. Just thought I'de point that out.