Cello978's Better Thieves Guild v1.0

This mod adds "The Waterfront Sewers" which the Thieves Guild has made their home in.
This is the third out of five of my "Guild Mods". when I started making this mod, I thought that the current guildhouse was way too small and cramped for such a powerfull and rich guild. so I set out to make a better guildhouse for the ThievesGuild!!