ok i just downloaded it and i think that you have done extremely well. i recognise many of the graphics (from medieval 2) and i think you have done a good job at this.
a few small suggestions:
1. All of the in-game voice is from rtw, and it says stuff like 'rome will be amazed at such a victory'. this really needs changing (there is some sound on medieval 2 which would fit). much of it is just annoying anyway and should have been removed from rtw vanilla.
2. On a few factions it says senate. i know what this is - you have it from when julii scipii brutii spqr had a roman culture and therefore the senate thingy was there. unfortunately it has no use here and needs to be removed. by changing the culture you may eliminate this problem, but i am unsure of how much would have to be edited. there are a few files where this comes up.
3. The factions text is huge, but the units/buildings text is tiny. Surely it would only take you a day or two to think up something for each unit and building, so this shouldn't take long.
I would be willing to help, but i only have very basic rtw/m2tw modding knowledge (really easy stuff like unlocking factions and adding units to other factions). If this could come handy let me know and i'll be happy to help. lol