I like this idea, I really want to see a junk with the bat wing sails. However there stats you are proposing would make it extremely overpowered. So balance it's stats differently because I'd love to see this in the game.
The galleon is an older ship, the specific one that comes to mind is the video Golden Hind which was sailed by the privateer Sir Francis Drake. It had 22 guns.
The Frigate is a newer design, the one that immediately come to mind is The Queen Anne's Revenge, which was sailed by Edward Teach (Blackbeard), it had 40 guns. He sailed it less than a year because it was run aground.
The Royal Fortune sailed by Bartholomew Roberts was a Man-O-War. It had around 50 guns and was sailed across the Atlantic and abandoned because it leaked.
I think either the Frigate or the Man-O-War would be nice to add to the game but not both. They are too similar. Also the difficulty would have to be pretty high for that amount of firepower.
The most common pirate ship was actually the sloop, followed by the brigatine.
Edit: I did a little reading and apparently the Spanish had galleons that could carry as many guns as a British Man-O-War.
A skiff might be good for solo players, really fast and maneuverable, with a single cannon on the front that can be fired from the wheel. Maybe this would give solo players a chance.