Design, computer lofting, and kits for welded aluminum boats. specmar inc (previously specialty marine contractors) is an aluminum boat design, lofting, and kit company.. The code of practice for open rescue boats of less than 15 metres in length rev 0712 4 11.3.1 general requirements 11.3.2 damage stability: rigid hull boats. This summary will provide some general information on the new 87 foot coastal patrol boat designed and built for the u.s. coast guard. this unique vessel is a multi.