Good luck Heathen Storm, you've picked a fairly difficult time period to accurately (with any certainty) portray unit rosters and settlement names especially in Britain.
Although... I'm not sure why a mod focused on Alba needs to have so much focus on lands as far away as Russia, Byzantium, Asia and Italy, and even Spain. It seems that your mod description does not match up with your wanted inclusions. You need to focus more on what your mod is about and less on what you can add into it.
It seems an overtly ambitious project that needs some more clarity. Good luck, I'll check in with your forum to see how it's going from time to time