Earlier models, with the exception of the 26 and 27 were offered as semi-custom. The details of hull layup, interior and deck construction and design could be modified by the buyer. It has been estimated that more than half were modified to one extent or another from the base design that was offered. Some decks were klegecell-cored, some were balsa. Some hulls were solid glass, some were foam or balsa cored. Some cored hulls were cored only above the waterline, some all the way. Similarly, tankage and rigging details were allowed to be modified by the buyer.\r\nThanks to Steve Wolfe, a Soverel builder from 1975-1978 for this information.