User blog comment:SsVivid/Monetary Reference Table/@comment-4536066-20130820204241/@comment-4536066-20130821003858

I'm thinking the price of a large two-horse covered wagon (800gp) multiplied over...


 * +1  for requiring double wood materials,


 * +1 for specialty supplies,


 * +1 for workers to build it,


 * +1 for the services of a reliable engineer

for one small ship, so 800x5 = 4k.

A big ship might be +2 for wood, special supplies, and worker time, so 800x8 = 6.4k, and +3 for a huge flagship, so 800x11 = 8.8k.