Design, computer lofting, and kits for welded aluminum boats. specmar inc (previously specialty marine contractors) is an aluminum boat design, lofting, and kit company.. Boat plans catalog – 300 boats you can build! boatbuilding supplies & epoxy; inboard hardware; new – electrical design plans; boatbuilding with steel & aluminum. Premium cnc boat kits in aluminum alloy and steel welcome to metal boat kits! we offer premium quality stock boat kits in aluminum alloy and steel..