As has been said earlier in this thread, whether a ship is called a "Ship of the Line" or not is immaterial to whether it's appropriate to add to the game at this stage. This varied from nation to nation and from period to period.
What matters is the gun count. If the ship has 50 or fewer guns (and all other historic data check out), all is well. Such is the case here.
The ship will be balanced as we (read: Taelorn) sees fit, though we do listen and take note of what people are asking for. This isn't necessarily the best thread for that though; I'd recommend the
Ships, Ship Combat & Ship Skills forum for providing that feedback. The right folks lurk there more often than here
