Finally a very bad rework
Very bad rework because some civilizations ((Vikings, Portuguese, Koreans) loose access to demolition ship because of the IU. We say them that it was possible to keep access to all the ships without changing the IU see below.
Also we must to go to another building (university) to research the naval technology.
Here a proposal to keep access to al the ship line and having all the naval technology in the dock :
Also the new Catapult Galleon only available to Aztecs, Cumans, Inca, and Maya is very bad because many other civilizations before gunpowder era can benefit from him, see the list here.
No new sail type for south asian civilizations and south american civilizations.
The good things :
Hulk line and Catapult Galleon are good. Trading for wood also. Garrisoning fishing ship is also good.
He may be better to merge the upgrade of the demolition ship line with the upgrade of the other ships line.