If you are going to reinvent the wheel, you will want to keep things as simple as possible, at least to start. Personally, I wouldn't bother with specific styles. Let your players come up with their own styles using feats, or, if you HAVE to have distinct styles, give each style a list of feats that a player HAS to take, as they qualify for them. They won't have mastered the style until they have all the feats required.
(Or you could just play the WEG D6 version, which is a lot less complex than 3.5
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