I'm interested in undertaking this project but i'm not entirely sure i'll be able to do it alone. Most of the work will be on the campaign map of course, and only minor skin editing will need to take place.
I was thinking a series of mini-campaigns maybe, with a 'grand campaign' by replacing religion with 'support', so Catholic and Islam becomes Lancastrian or Yorkist, and the pope is the king. Then each player would play as one of the lords and fight for control of the king and the country. Factions could be France, Burgundy, Scotland, and the various English lords (Warwick, Edward, etc.) who would be split between Lancastrian and Yorkists.
That should make for a really interesting game - kind of a political game going on in the background, as you could do all the political backstabbing between lords to make sure it's you who gets to control the king.
Anyone interested in helping me with this?