Not representative of general ship construction in the Mediterranean. Indeed, perhaps unique in Mediterranean ship construction (but very important), was the "Arsenale" in Venice.
The Arsenale was a ship production factory, responsible for building Venetian merchant and war ships, and for many innovations in ship and weapon design as well as in production technology.
The Arsenale is legendarily supposed to have been started in 1104. It was expanded in 1320 (the Arsenale Nuovo) to cover 110 acres, the largest industrial facility in Europe.
The Arsenale introduced mass production of ships, especially war galleys. From standard components, built in the Arsenale's workshops, the 16,000 strong workforce could assemble a galley in a day, using a moving assembly line, where the ship under construction moved down a canal from assembly station to station.
This capability proved critical after the Battle of Curzola, in 1298, in which the,Venetians were defeated by the Genoese, with the loss of 83 out of the 95 ships in their fleet, and 7,000 men. (This is said to have been the Battle in which Marco Polo was made a prisoner of war by the Genoese, giving him time in captivity to dictate his famous book.)
Genoa thought it had smashed Venetian seapower, and would dominate the Mediterranean. The Arsenale, however, swung into high gear. In record time they built 100 new galleys and managed to prevent a total Genoese victory.
The Arsenale had its own forests on the Venetian mainland. It pioneered frame first construction of ships in the Mediterranean rather than the previous hull first construction technique which had been used since Roman times. The Arsenale introduced the galleass, a hybrid sail and oared ship which could carry many more cannon than a galley. Although these ships were slow and clumsy, they proved invaluable in the great Battle of Lepanto, which smashed Ottoman naval power in the Mediterranean.
The Arsenale also innovated in the early production of more powerful cannon and shipboard artillery. Galileo was a consultant and scientific advisor to the Arsenale.
This great maritime factory, was one of the reasons why Venice managed to rule the Mediterranean through most of the Medieval period.
http://arsenalofvenice.weebly.com/