Cities with castle walls

[rebelyell2006]

Just out of curiosity, if I switched the settlement type requirements for core_building from "city" to "castle" and switch the settlement type requirements for core_castle_building from "castle" to "city", and adjust the settlement minimum requirements for the castle wall buildings so wooden_castle requires a town, castle requires a large_town, fortress requires a city, and citadel requires a large_city, and if I go through descr_strat.txt to make sure that city settlements have core_castle_building and castle settlements have core_building, would this entire scheme work? And in a campaign with this in place, what would be on the battle map during a siege? Castle walls with city buildings, city walls with city buildings, or would it cause a CTD?


EDIT:
OK, that idea completely failed. Could somebody delete this thread?