See this contest I am reminded of a beautiful story as I write below

The construction of the outrigger boat is very unique. Boat hulls are formed as connecting boards on the hull. Then connect to the wooden peg without using a skeleton, bolt, or iron nails. The tip of the bow and the stern of the ship shaped taper. The ship is equipped with two rudder-like rudders, as well as a rectangular screen. The Javanese ship is clearly different from the Chinese vessel whose stomach is fastened with wooden planks and iron nails. In addition the Chinese ship has a single rudder mounted on the stern rib.

Quoting from Jung Java: A collection of short stories by Rendra Fatrisna Kurniawan published by Babel Publishing, written in the preface of the 2009 book that Jung Jung, first described by the Portuguese, was a ship they captured in 1511. The Portuguese recognized Java as the origin of the giant junks. "From the Kingdom of Java came the giant Junco ships to the city of Malacca. The shape is very different compared to our ships, made of very thick wood, so that if the wood is aged then the new boards can be superimposed on it.