The Skipper is waiting impatiently I see
. Half bricks or (2X 1/4) are cheaper and easier to find and safer than lead for ballast.
I think you could do with reducing the top weight too. Fret out windows on the wheel-house, good for cooling to if you dont glaze them. Hope that isnt a mast, too tall, make it an exhaust stack. Your "box" over the deck opening sides could be reduced a bit to allow the hatch cover sides to sit on the deck . All reducing top heavy-ness. Plenty of pirate figures in charity shops and little friend`s toy boxes I`ve found.
. Use spare bit from mast to make a couple of cannons ! Copper pipe scraps from plumber good for cannons too, while you are down there scrounging for lead he he, take the kid. They cant resist a bonnie child
Not sure about the push-knees being so long under the waterline.