Mannequin advice

I was wondering if anyone out there could give some advice on their experience with mannequin construction, especially in durability ( I am creating a number of “Blind Dead” Monks, reapers and witches). Looking at several methods and need to determine which one will last best in the elements for one season of a haunt that is outside. Paper seems to be out so maybe cheesecloth strips and carpet glue followed by latex, and protective coat? Other idea was using some of Allen Hopps methods of plastic.