Well the problem I told about above killed the scene lol
I figured out that remodeling it will be a lot faster than
fixing it. Now I'm a lot more cerefull with groups and instances.
So here goes scene number 3 =)
Again just wireframes. I guess it's a bit over detailed
in some parts but it should add more
depth after lights are added (at least I hope so)
And the doors look really flat now but again
it should be fixed after lights are added.

https://img231.imageshack.us/img231/8694/test1xv9.jpg