Balkan techtree.
You can help on greeks, but i want as few as possible involved in amazons, for now, arhcmage is the only one with a little accreditation for the bubs on the warrior/swordsister.
, my friends an amateur at modelling but he has plenty of ideas and I'll post them here with his permission, at any rate here are some inspirations
slave-worker unit
peltast-fast infantry unit, light armor, low hp, high speed, high damage and ep based spear throwing attack.
hoplite-obviously heavy infantry with high armor and hp, slow movement, and a high damage stabbing attack, can promote to spartan hoplite
spartan hoplite-improved hopite
teti-I think this is what its called, it a slinger, very cheap low armor, low damage medium range.
sarrisa trooper-dude with a sarrisa, large range, similar to hoplite but with a slower higher damage attack.
companion cavalry-elite cavalry, there can probably be a basic cavalry somewhere
some olympic sport based upgrades to improve stuff would be fun and interesting