Orius said:Maztica would probably make a good starting point, especially since it can be downloaded free, but the culture is in many ways a direct cut and paste of Mayans and Aztecs. Reading the history section is like reading a text on Mesoamerican history with the names changed. And, I'll second checking out Dragon #315 if you can, it's got 3e stats for jaguar and pluma knights as prestige classes, it would probably be a good foundation to build a conversion upon.