I don't know how far it is possible to make such a fire-balloon-not-gun-thing or invent that big engine (with more health so it can take moonshine much longer), so I can't say anything about that, but I really like your drawing! I'd like to see a small ship with guns pointed to the back (and front maybe?) only too!
I don't think it's a good idea to crash your best engine into an enemy's hull though.