Extra Planking

 is a Permanent ship upgrade.

Crafting materials

 * All materials are given for the Basic quality level
 * 250 x Planks
 * 15 x Iron Fittings
 * 10 x Cordage And Oakum
 * 15 x Wooden Fittings
 * Higher quality level require +5 planks per level and +1 of each other component