Actually, after playing a bit of BOS Wars and getting Aleona's Tales and Doom Wars both running, I've realized it's probably better for me to use one of those as a base. So, yeah, this topic was a waste - sorry, my bad.

Basically, I wanted to do an ancient-themed game focusing on major civilizations of the Eastern Mediterranean, starting with the Greeks, Persians, and Egyptians. Gameplay would be similar between them (like having almost identical buildings), but there would be noticeable differences in terms of unit balance and overall strategy (e.g. Greek units would generally be tougher and more powerful, but also more expensive). I might think about expanding to include more civilizations later on, but these were the starting three I came up with.
Nevermind, I've got a better idea.

Thanks in advance for any feedback.