There's an OSP Blunderbuss?
Oh, and can I suggest a troop tree for Marines/Sailors?
Marine Sailor
Marine Sharpshooter Marine Blunderbussman Boarder Sailor with Musket
Marine: Average grunt with musket.
Marine Sharpshooter: Worse melee skills but better accuracy, damage and range.
Marine Blunderbussman: Marine with a weapon good at short range because of bad accuracy and high damage.
Sailor: Sailor with a cutlass or a pistol.
Boarder: Sailor with a pistol, a boarding pike, a cutlass or a axe. Fast and high damage but low HP.
Sailor with musket: A grunt with mediocre firearms skill but good melee.
EDIT=Danish Dragoon Uniform finished!
Searching around in MBRepository reveals a Basket-hilted sword suitable for medium/heavy cavalry.