This kind of online campaign is just not viable as has been discussed countless times in the past, ad nauseum. People are simply not going to hang around for an hour waiting for someone else to finish fighting a battle. Also I'm not sure how you're going to get Civ4 and RTW to work together... Sorry but it sounds like a a wild concept only, and one that has not been properly thought out. Modding can only do so much, and some of this seems beyond the scope of regular modding.