Searched this topic, know that no one gave the Mod idea that fit my idea completely, so, I think there's need for me to tell what I thought.
ONE - 'I have a mod idea - here are the details'
Holy Roman Empire (The whole game takes place in Holy roman empire, which means there's no other Kingdoms or Duchys. The war happened between every classes feudal lords of HRE)
REASON:
1.The general feudal system of HRE is so similar to M&B, that is to say, under the game engine which M&B used now, you can easily made a world more similar to HRE.(2 - 150 battle size, small scale territory, south of North sea, east of Rhein river, west of Warsaw、Konisburg、Budapest. In HRE, medieval German, dotted by thousands of castles)
2.From the beginning, I believe that most Players are attracted by fighting as a heavy horseman or a skillful european knight in the game. In HRE, there 're so many lords who are renowned because of their Chivalry, like Friedrich I (Barbarossa, he was one of the Emperors, joined third Crusade with "Lion Heart Rechard" of England, and finally drowned in a river in anatolia. He's been thought as exemplification of Chivalry)
DETAIL:
1.factions:
Saxon - ...... ?
Bavaria - ...... ?
Franconia - ...... ?
Prussia - ...... ?
Swabia - The Duchy of swabia
Bohemia - The Kingdom of Bohemia
Austria - The Duchy of Austria
Burgundy - The Duchy of Burgundy
2.troop type:
Now that the world map only limited in HRE, all feudal lords believe Catholic, their culture、armour、equipment are all er~~~ "german style"troop types should be no big difference. For example:
saxon has almost the same troop type of prussia, but their highest class horse troop are different both in name and equipment, saxon - knghit、prussia - teutonic knight.
or saxon - crossbowman、prussia - shooter.
3.Hierarchy system:
It is almost swabian sort, but the historical and specific feudalism setting could consult historical metarial. No matter who was crowned to be Emperor, he can takes advantage from the status of it.
I think many players like to spend money to buy such a expansion patch.
Yes, I will revise my post of the sentence or commonsence error in the after several days !