You can actually do that, one of my maps for the MHA as in that collection I made is a cruise ship that is sinking. What I would do is make the boat, save the map as is then just make copies of it editing the map around the boat . ect.
There are also map assests in another post I made that might be useful to you. Generic stuff that crates are good for ships, I believe there is an anchor amongst it but intrepret the items as you see fit