SAUGATUCK — One of Saugatuck s last commercial fishing shanties will find a new home and new life in the hands of the owners of Retro Boat Rentals, the Saugatuck-Douglas History Center announced in a news release.Retro Boat Rentals will preserve the shanty at their 730 Water St. site, just down the street from the structure s original location where Marvin "Demi" Demerest, one of the city s last commercial fishermen, once used it.The Saugatuck-Douglas History Center will turn the shanty