We already have "wolf pack" and "pirates, raiders..." - 2 different rulesets for pirates.
Edit: This doesn't mean that you shouldn't create pirate rules. It just does mean that you should check these two rulesets, for inspiration. Or, if you wan't to create something etirely different, to make sure your rules are not too similar.
Edit2: And yes, this does mean that i am interested in your final results. ^^