Hey Celdur, I modded your castle a bit, mostly just little things like structural reinforcement and things, but I did make a small hall. Maybe if the roof is heightened, it could be a banquet hall. I'm still not entirely used to the way Minecraft works. I hope the author implements more Dwarf Fortress-y things soon (i.e. farming, actual mining, livestock, enemies, economics, etc).
Perhaps map trading and modding is the most simple form of multiplayer in this game.