Hello there DoomOnYou72 & Pathfinder Dubstyles.
Among many other sources, Realms of Chaos and Paths to Glory were both used as reference material during the research, writing & development of the Border Town Burning setting for Mordheim.
Half of this Chaotic campaign supplement involves aromping about in the Northern Wastes territory, referencing both the Shadowlands and the undefinable borders of the Chaos Wastes
From the content of your posts, neither of you were aware of this. If that is your dream setting for Mordheim play as you describe, then do yourself a big fat favour and check it out;