Watercars could easily have come from the same drawing board as the Can Am Spyder, that weird snowmobile-style tricycle that somehow made it into production. But they didn’t. They came from the mind of custom car and boat builder Dave March. Amphibious cars are nothing new but nobody makes them like March. His Watercar brand offers two models. One is a hotrod built around a Corvette motor and the other is a bolt-together kit that converts a variety of cars into badass boats.