Thanks for the chapter! Also don’t forget to cover sea prism stone to the bottom of the ship so it can cross the calm belt safely and make the submarine be made with sea prism stone as well so seakings don’t attack it.
So far in One Piece, all kings of the sea in one piece attack what they see and the hull will be invisible from below, it would be like the coating of sea stone, "you can't beat what you can't see, apart from a few things that it will make the ship very interesting