Think them ingenious, historic, or simply charming, millwork built-ins are an essential part of the Arts & Crafts house. Those surviving bungalow and Craftsman built-ins are economical with space and functional in design. A buffet recessed into a dining-room wall eliminates the need for a butler’s pantry. A bench tucked against a staircase creates a place for rest or dropping a package in a narrow space. Bookcases make excellent use of the dead space on either side of a chimneybreast....