I think this would be a very neat way to be able to get scarp metal. You know how you get materials floating from you and you start thinking of ways that you are getting them. I was thinking of enabling a sunken ship that has been giving you supplies. You should be able to go to the ship and mine away either with a hatch or a pickax and mine away at the ship and every hit or so you get one scrap metal just like how every hit or so you hit a tree you get wood planks or thatch. Just thought it would be something interesting