Is it possible? unit graphic change when enter new era

[Pekorin]

I want to change the worker graphic to a new one when entering a new era

 

[Nutty]

Er, they already do (once). You want it to happen more often? Do you have 3D models that you intend to use?

See this thread for a short explanation of how it works. I can make it a longer explanation if you can be clearer on what you're trying to do.