I would first like to say that it's great that the barbarian factions have stone walls, but I'm a little concerned about the appearance of the Dacian walls. Currently the Dacian wall looks a lot like the Celtic oppidum but that seems very inaccurate. The Dacian walls were much more advanced and built with far greater precision. That is why I would suggest changing the appearance of the stone walls for the Dacians (if possible) to something more appropriate, with sharply-cut stone of uniform dimensions.
Here are some images of the murus dacicus to give you an idea of how they looked like:
exterior

exterior

internal structure with soft core and cross-linking wooden beams

As can be seen Dacian (and Thracian) walls looked more similar to Hellenistic architecture than the Celtic oppidum. Is it possible to change the appearance of the walls (or even the texture) for the Dacians so that it looks more like the actual murus dacicus?