Wow, this is all great stuff. I especially like the fluff about Dragonborn and Dragons.
My current campaign has a few similar things, though nowhere near the extend that you have them. The main parallel in my campaign is the Ocean of Stardust where the veil between the Feywild and the world is thin. Sailors easily lose themselves in the Feywild and few dare travel in the Ocean of Stardust without a Eladrin navigator. The farther out you go the closer the worlds become until you reach the end of the world and enter into the Astral Sea.