Yeah, the idea is to heavily focus on the Imperial and Shogunal armies during the war. Each army will have their Western retainers and Samurai auxiliaries, of course. And, possibly have an addition of a nearly all Samurai faction, to keep a heavily traditional army, for people who want to play as them. It could actually work very well with the Warband engine. The only thing is making scene props that fit the time period. Unless of course, the mod focuses strongly on the land battle, with little to no props, other than trees, hills, rivers, etc.