Author, I don't know how you're going to build the ship, because I'm still on chapter 10 (I'm a new reader), but I wanted to suggest a fruit that I thought of, that you could feed to Bell's ship (it's an invented fruit), it flame Transform Transform No Mi, based on Transforms, the fruit can follow two paths:
The first being that the ship can transform into a Transforms;
The second is that the ship has the power to transform into any vehicle, from cars to planes or even spacecraft (now if you want to be simpler, the ship can only transform into other types of ships, but in this case I thought of the name of the fruit, instead of Transform Transform No Mi would be Ship Ship No Mi).