When you say you want this historical do you want the player to feel like he is a king experiencing the game for the first time or like a history student sitting in a class room? It always annoys me when great mods lose the atomosphere of the era, but talking about things like units and building descriptions as if they were writing for a school book. I prefer to give a touch of wonder as if we lived in the time experiencing all these things happen. Were they the will of heaven? Who knows?