Sam devlin produces a lot of plans. most of them, he makes available for anyone to build. this is where you can see his designs that are available as plans.. The following cost and time figures have been submitted by builders. if a year of build was provided, we have included that information, otherwise the date of. Boatbuilders, manufacturers & repair yards n to z: naiad inflatables (manufacturer of rigid hulled inflatable craft, new zealand) najad yachts of sweden (fiberglass.