Here is a great idea for an empire mod, Temeraire total war. This mod would be based of the Temeraire book series by Naomi Novik. The books take place during the Napoleon wars and armies use dragons as an air force. Dragons are outfitted just like a ship with guns rigging and a crew. The only hard part about creating the mod would be figuring out how to make the dragon units fly. If my description sounds bad wiki or google the book.
Edit: Still no replies? I didn't think my idea was that bad.