Specmar inc (previously specialty marine contractors) is an aluminum boat design, lofting, and kt company. we have a large product line including aluminum drift boats. Yes, with the right house boat plans, you can start building your own now yes, with house boat plans, you can build a houseboat. when it comes to planning building a. $345: sport boats: hull 960 "kenai" has a high forward chine for white water boating: 15’6" 7’0" 1048: $759: hull 922 wider sportster with bow cockpit for water jet.