As far as I know, The pirate ship was initially purchased so that it could go in the dungeon he's working on. When he started working with it, he noticed that it could easily be turned into a house, and got sidetracked on that for a bit. He mentioned it's now been turned over to Damien for a pro to make it into something really useable (in both cases). They want it fo have things like interactable port holes, translucent windows, a different flag, and more. Now they'll have a priate ship for pvp, in Chris's dungeon, and it looks like keep and castle sized homes.