About the Iberian Peninsula:
1. Culture:
I have seen Duchy of Galicia culture is the same of Portugal in this mod
good work! much better than calling it "Castilian"
...but, the correct name for this culture is "Galician-Portuguese" :wacko: although I understand it's too damn long to put it in the game
2. Military Orders:
In the 1187 scenario Calatrava county is set as part of the Almohad Empire but with a "castilian catholic" ruler. The "castilian catholic" ruler is ok but it didn't belong to the Almohads nor to the Castilians, it was the home of the military order of Calatrava, a spanish knightly order similar to that of the Templars -but not as powerful-.
I don't know if it is possible, or even a good idea, to put new military orders in the game, but this are the Iberian ones:
"Order of Calatrava" (in Calatrava province) with it`s fellow branches of "Order of Alcantara" (same name as the province too) and the portuguese "Order of Aviz" (home in Evora).
The "Order of Santiago" (castilian, homed in Cuenca, not in Santiago) was in the XIII century the most powerful.
The XIVs Orders of "Montesa" (in Valencia, aragonese branch of "Calatrava") and the portuguese "Order of Christ" (a templars branch).
It's interesting to note that in the game the Alcantara and Calatrava shields are those of the Military orders of the same name, not a family or county heraldry.
3. Santiago de Compostela and the way of Saint James:
Santiago de Compostela was one of the most sacred places for christianity during middle ages, second only to Jerusalem and Rome.
I don't know how it's implemented in DV but in CK "Santiago de Compostela" (the "Compostela" province) was not a primary target for crusading.
In real life it was never taken by the moors (although it was looted by "Al-Mansur"), but if this had happened it would be for sure the main target in the whole Iberian peninsula, despite all economical and political interest.
ps: very good mod