A hefty, hirsute character actor with a menacing but still often sympathetic presence, Maury Chaykin has specialized in small but startling appearances in American features, while finding his true niche in Canada, where his lack of physical perfection has not impeded his landing interesting leading roles. The exceptionally versatile player formed a band of traveling performers, the award-winning Swamp Fox Theatre Group, during his undergraduate years at the SUNY, Buffalo and later studied at San Francisco's American Conservatory Theater, working with playwright Samuel Beckett on the only