Change thread title to "The Primordial Plane"? Other than that it looks good. It no longer exists for (almost?) every campaign world currently being played, right?
Would make a VERY different campaign setting (just wind the clock back untold millenia). What with Dimension Door availible to everything (at will?) and no gravity and psionics only... mutations and changes might be more common directions of advancement than standard classes... and equipment might be almost nil...