Café de Nuit

I'm probably going to write up something more detailed on my blog, but how would you guys make a domain based on Geoff McKinney's Ravenloft?
Sorcerers already a lot of vile stuff so I can only see one going over the line to Darklordom if a sacrifice was a close relative (but then again one ritual requires the death of an infant son)
I could see an obsessed Lawful fighter loaded with alien tech waking an Old One just to kill it, leaving a swath of death and destruction could become a Darklord
A Spawn of Shub-Niggurath rebelling against the Old Ones? Darklord material?
There need to be sources of alien tech: Abandoned cache or active factories? Both?
Would the supersmart Space Aliens/Great Race/Primordial Ones notice something amiss with Ravenloft?
Carcosan humans can't interbreed with each other or "normal" humans and have the same lifespans. Maintaining viable populations for all the 13(?) races of Carcosa would require a lot of space unless something spawns them or somebody does some magic
Speaking of spawn, would you include a source for them? Maybe a chunk of Shub-Niggurath?
How many Old Ones should be wandering around? 1? 0?

1 Use the thirteen steps of corruption model, not the shorter, original Ravenloft, path.
2 Apply powers checks to sorcerers just as you would to anyone else. That means sorcerers will all eventually become 'creatures of Ravenloft' and possibly darklords.
3 The Land includes a lot of small domains inhabited by darklord-sorcerers and eldritch horrors and mad cults.
4 conjunctions between domains and other worlds occur whenever the Stars Are Right.
5 Sorcerers may know rituals of conjuring that rip people and creatures and things from other worlds.