First of all I would really like to ask those who are doing the mod to change the name of Spain for Castille.

Spain is a modern concept and NOT, as the Spanish claim, originating from the Roman Empire. The Romans called it Hispania, which meant "land of rabbits", because when they invaded it it was known for being very green and very wild. The Peninsula was divided into three provinces during the Roman empire which did NOT correspond with what modern Spain is.

Thus it is the Kingdom of Castille-Leon which the game is dealing with, a power which struggled to fight back the moors for various centuries.

Also I hope that the Principality of Catalonia/Kingdom of Aragon will have the Almugàvers as one of their unit. It was VERY annoying to see them as Portuguese units in M2TW because they have no connections whatsoever to the Portuguese!

Don't forget that the Catalans were the initiators of maritime law and the major sea power, together with venice and genoa (and the Turks) in the Mediterranean. Hopefully that will be reflected too.