It's a big boy! Or, girl, I realize, since ships are normally female-coded. And yet for all its size, it's still a pretty cramped space; even the main deck isn't as open as it appears, because there are lifeboats to consider.
Ships are WEIRD to draw; there are seemingly infinite varieties of sailing ship with just as many layouts, so this one is a best-guess homunculus of a couple different ships. The extra gun deck may be a bit too advanced or heavy for your purposes, so feel free to remove it if you need.
I'm also a little iffy on the second deck; in the layout I referenced, the rear area was designated as the "warrant officers quarters", but doesn't have a lot in the way of description of what goes there. I leaned towards "designated sleeping area", but in this economy of scale, they probably would have had to sleep next to more guns.
I'm busy working on my blog posts. Watch this space!