planking
I have done it already, I am interested in the way how to shape round hulls with flat paper: I think you could get a better result with successive layers glued one onto the other, and each step, you grind with a file, people usually use for metal (not the one for wood) before you go further. It gives a result far above ( yes, that's true !!! ) the one you got.
On the contrary, I am amazed at you attempt, for people don't worry usually about that problem. The way you did is close to the real construction, and moreover, not difficult to achieve.
For that, I used water based glue, the white one, which has the advantage of making the paper flexible.