Looks pretty good. I'd probably want to add something about having a duty to their lord or clan, which would complicate adventuring. Say, each month or so roll d6 and if it equal to or lower than their level, they are called on for some service, ranging from simple message delivery or escorts to fighting a duel or mustering for war. Or at least throw down some honor restrictions (Can't refuse their liege's summons, death before dishonor, etc.)Also, no shields! Samurai don't hide behind shields.