Four masted ships
Most four masted ships weren't built until the mid 19th century, but there were large galleons (often in the Spanish treasure fleets) with 4 masts during this time period, along with a few Vaisseaux (French Ship of the line style) made with four masts, In 1801 the first four masted Barque ships were made, not to mention a small number of Asian ships that had 4-5 masts that were made leading up to the first Opium war (not the Zheng He treasure ships). Will we be seeing any ships of these sorts? It would be quite interesting to see them as a bit of a rarity, considering until the 1830s-1850s four masted ships weren't common.
Four Masted English Galleon
https://upload.wikimedia.org/wikipedia/commons/b/b1/English_Galleon_Model.jpg
Four masted Barque
http://www.bruzelius.info/Nautica/Ships/Fourmast_ships/Invention(1801).html