I don't know how attached you are to the castles, but might I suggest a re-design of the various castles? Right now each of them is enormous. The green castle, especially, is difficult to navigate, with important areas distributed all the way from the top of the castle to the tunnels. I believe smaller, more compact castles would be much better for playability and usability. Plus it feels sort of silly to have a massive fortress when you only have a handful of players in your faction.
Even if you don't want to redo the castles, I would really appreciate a re-design of the green castle. It's a huge walk from the tunnels all the way up to the roof.