Why couldn't you build wings that were hinged at the hulls but supported by a cable to a pulley at the mast hound? The cable would have stops in it as it rolled through a pulley it would raise the leeward wing vertically in relationship to the hull. You could even predetermine the length of the cable such that when the windward wing would be at sitting height when the leeward wing was in line with the cable and the mast and you wouldn't need the stops. (i.e. the cable won't come out anymore).