If your sims have a desire for adventure out on the open sea, then a houseboat is what you need! the addition of island paradise enables sims to live out in the. Welcome to twin anchors marine custom built houseboats! why not start by seeing some of our luxury houseboats?. Building a houseboat is a great achievement. with a dream and some houseboat plans you can build a wooden houseboat, a shantyboat, or a floating tiny house.