Fang Hong had no plans to be unconventional, so the Seven Seas Traveler still primarily adopted a traditional ship design.
As for the number of ribs on the ship—it's obvious that the more and denser the ribs, the less likely it is to 'list' in the event of damage. Conversely, the denser the ribs, the heavier the ship itself becomes, and the ribs can only be made from Magic Oak and Blackwood, which are more expensive.
Generally speaking, main ships tend to use denser ribs, while exploration ships, patrol ships, and raider ships tend to pursue lightness, maneuverability, and speed. Considering the enemies that the 'Seven Seas Travel Group' might face, he ultimately chose a ship type quite common among escort ships, following the suggestion of that Dwarf Artisan Master.
'Katin-Type ship.'
