N1.  spooky atmosphere, I like it.  Intriguing hole in the ceiling 

er, pathnodes, like an apple truck crashed.  1/4 of the nodes used would work fine... but I left the map alone ^^  Important tp path are mainly door entrances, stairs and zs moving around awkward objects.  Usually line-of-sight they will find you even in a 4096 square area.  
I like the map.  Your description fits the maps feeling exactly 

  I'll upload it and Raj will move it to the server play area if he didnt do that already.