Buildings in cities and around the place...

i searched for tutorials and found none that sated by thirst for knowledge...the question is, does any know how to make new buildings appear in cities as they develop, and how to replace the awful cubic models for insulae, and houses in greek/roman cities? i don't want to add buildings to the construction rooster, but rather buildings that appear in battlemap views that are generic buildings...

I would imagine it would be a matter of finding the relevant cas file for the generic buildings and editing it. There are a couple of tutorials in the buildings category that talk about editing the model
https://forums.totalwar.org/vb/local_links.php?catid=72