No, so far as I'm aware they are all static. All the leveling changes is their resistance to seige engines in the world map seige state.AFAIK castle scenes change with regards to the upgraade level, no? So a lvl castle will have wooden ramparts while a lvl 3 castle would have stone ramparts.
For example there is one particular city layout that I hate to own becasue it's almost impossible to defend. It's walls are so short archers on the ground are as effective as those on the walls.






