Wow. This is, quite frankly, awesome. I like how you incorporated weapon size as well. There is something I would love to see though, which I think your system could accomodate even though standard D&D does not... a differentiation between blunt, slashing, and peircing.
There is a real cinematic difference in feel between these types, but almost no mechanical differences at all, and this bothers me. Yes, I know that heros use whatever they have on hand equally well, but they do it in different -ways-. And besides... swords were made for killing people. There's a reason Samurai went into battle with Katana instead of Boken (Bokken?). Under these rules, there'd be no real difference.
My thought was that the three weapon types would get a list of special qualities that could be added with a grip like everything else... like one technique per feat. I... uh... can't actually think of any at the moment, but then, it is 11:30 and my eyes are drooping. I'll come back in the morning. But does anyone agree that this would be a good idea to add?