If I read the thing correctly all the buildings are fully decorated inside as well. The people that made this had a team that had people working on it round the clock. I think it said there were over 100 people working on it and it took them 4 months. The said they are going to try and recreate all of westeros then add it so minecraft players can download and run around in it. They also talked about adding in characters to the cities and buildings. http://www.westeroscraft.com/