>>The thing to remember about world building in this collection is that the fae originally started out creating worlds as a system of magic gathering, so that they wouldn’t use up all the magic Athare had stored within it. <<

So kind of like a sun farm, but with each solar panel using a different design. That's pretty cool.

>> I would love to get them all finished by the end of the year and have at least one story set on each, but I know this may not be possible. <<

I would focus on establishing a core group of worlds first, with a story for each. Then add the other worlds as they are developed, each with a new story as the world is opened to the public. That way, you've got room to grow as new ideas occur -- and, especially, it leaves space for new fans to claim a world.