That's a beautiful NS Poohead, I've got to step my game up.

I'll add stuff about where Skaven are, but they tend to live under human cities and occasionally in conquered Dwarfen Karaks.  Specifically I remember under Mousillon, under Tobaro, Karak Eight Peaks, with a capital under a swamp near Tilea.

Not sure how we want to handle that.

I'll make some edits to my NS this weekend to differentiate it better from Vanilla Warhammer and to include some pictures since Poo used them to such awesome effect