During his 30-year career with Sports Illustrated, Steve Rushin has written in press boxes and hotel rooms, on airplanes and shuttle buses, and aboard a ship crossing the Drake Passage to Antarctica. But at home in Connecticut, where he composed most of his recent memoir Sting-Ray Afternoons, Rushin sits (or reclines) in a small home office surrounded by books, papers, folders, and not a few tchotchkes…