I never used a kit. I just use blank pieces of wood that are available at craft stores, and begin with drawing a ship in the size and shape that I want to build.
Holes are drilled through wood that will form the upper and lower parts of the hull. Toothpicks are then inserted into the holes to keep the wood properly aligned during the rest of the construction. Draw a rough outline on the stacked wood pieces.
I don’t know how to put this any other way… And I’m not trying to be silly when I say… Now just sand away anything that doesn’t look like the boat you are trying to build. I started on a belt sander for the rough shape. Worked a little finer with a sanding drum on a Dremel tool, and finished with a piece of sandpaper.
A quick look at the hull next to the bottle. You will be doing this A LOT!
You can see that the hull is already larger that the opening of the bottle.
That’s why it is not built out of one solid piece of wood.