Stevens's design contributions to the recreational boating industry included collaborations with Outboard Marine Corp. to style the Evinrude Lark and Johnson Javelin outboard motor series. He also designed the Evinrude Lark concept boat, eventually produced as the Cadillac Sea Lark. Together with Bob Hammond's 1956 Lone Star Meteor, these designs may be credited with introducing post-world war automotive styling to leisure craft. Other work in the marine industry include designs for Owens Yacht Company and Cutter Boats as well as a line of stainless steel marine hardware for the Vollrath Company.