Ok. I was going to try to sum up the information in this thread for the location recompilation thread, and it was just too confusing. We've got a lot of good ideas here, but we haven't expressed them as a coherent whole.
So, I poured over the material here, and decided to take a stab at a more detailed drawing of the EnWorld Cosmos. It will readily be apparent that I'm no great artist, especially not with MSPaint. But, it's better than nothing, and maybe it'll help revive this discussion. What I've attempted is a summary of all the ideas in this thread.
Some notes:
The EnWorphant is not shown. He/She/It (remember, the EnWorphant is androgynous) is "underneath" the Prime Material Plane. The Ethereal Plane and the Plane of Shadow "surround" the Prime Material, at a "closer" distance than the elemental planes, and are likewise also not shown. Everything on this page that is not marked is part of the Astral Plane...it just goes everywhere. The Energy planes are not a static ying-yang symbol, rather, the citadels are constantly getting pushed around, both by energy beams from "above" and "below", and by the "hostile" matter in the opposite energy plane. The energy beams that emerge from the "bottom" of the citadels that go to the neutral plane form large "ropes" of energy, one positive and one negative. Not far "below" the Energy Planes, these "ropes" intertwine. I didn't show that well, mainly because I can't draw.
I guess if there's a Sigil or something like it atop the "Energy Spire" in the Neutral Plane, it's in the shape of a doughnut (torus). Well, it has to have a hole in the middle for the energy to get through, right?
Anyway, here's the drawing.