Ok I did a final run-through of the faction units (I skipped the rebels) and multiple CTD's due to a known vanilla bug and with the Seleucid Legion model being the only hang up, all I can say is that these new skins are FANTASTIC!!! The Romans look Great!!! the Carthaginians are Awesome!!! You can keep the current unit roster as is, remove the unhistorical ones and replace them with historical ones. I also see so much potential for the Egyptians as well, we can keep some of the reskinned units like the axemen and nile infantry and replace the silly ones like the heavy archers, chariots and pharaohs guard with Hellenistic and mercenary units like pikemen, Cretan archers and Galatians.
Edit:
I just Noticed the Seleucid Cataphract is the same Model as the Parthian Cataphract. While Doing some Rummaging I found these two Hellenistic Cataphract Models made by Intel for RS 2.1A for the Seleucids and Pergamum, now hear me out, based on the new reskins implemented these early model Cataphracts seem like they would fit well with the seleucids and could be a good base work for other Hellenic factions with Cataphract units. Just a thought.