I'm AFB, so I can't confirm this, but I'm fairly certain that every base class ever released by WotC that had full simple/martial weapon proficiency also had full BAB. I can't think of a single case where a class with 3/4 BAB had martial weapon proficiency.

Just some food for thought. I'll give a more concrete PEACH in six hours or so when I'm back from work. Looks interesting on the tin though, Ziegander.