This thread might interest you. The idea was to implement all the Planes of Power in a way that they are only accessible from the original three continents (in other words no PoKnowledge or PoTranquility).
http://www.project1999.org/forums/sh...ad.php?t=11879
It was just a purely hypothetical for fun thread but some of the zonelines you already mentioned would definitely fit with these planes.