Its a good thought, but seems like one plane of hell of a lot of work to do. you realize that you are going to have to restructure every spell, rework alignment (if you plan on keeping it), decide what happens when someone acts outside their sphere, add new skills and feats, remove some skills and feats, redistribute alignment, and this is all for just the character classes. You are then going to have to do all of this and more for every monster that you ever might use from any of the monster manuals. This is not to discourage you from taking on this endeavor. far from it. i encourage you to do so, i would like to see what it turns out like. and i would be willing to help beta test it if you need. just let me know.