I walked into a house earlier where someone did this, it worked fine

It makes me wonder if houses should be seperate areas like they are now, though, considering the desire to make them the same size they appear on the outside. It's probably easier than trying to implement an isometric line-of-sight system that would give inside and outside meaning, though.
Have Z-levels been considered for Haven and Hearth? The once-awesome RPG World Online's mining basically took place one level below the ground and as well as for mining players could use it to expand their land or dig tunnels from one place to another, and it'd be nice to see something like that here, though I don't know what the impact on the server of having to deal with a world twice the size would be. Also, most of the Dwarf Fortress players would probably end up living most of their lives underground, so maybe not.
