looks great indeed, I longed for an AtG mod, especially since it has become common knowledge that the expansion shall be yet-another-invasion-of-the-barbarians thing. If you don't mind, there's a typo in the banners. The Greek alphabet uses two kinds of "s", the normal (the σ what you have there) and the "teliko sigma", an s that looks excactly like the latin alphabet "s" but is positioned in the end of the words. Meaning, if you have a sigma in front or inside a word, you use the "σ", if it is at the end of the word (as in all male names, for instance) you use the "teliko sigma".

You could use an English "s" in the ending of the words Μέγας and Αλέξανδρος (don't really know if you can see the Greek characters there... hope you can).

And lastly, I'd like to offer some of my (limited) spare time for research on this project. I am fascinated by the era of Alexandros and his conquest and I have quite a knowledge (and access to more stuff and an extensive library to boot) so I think I could help a bit.