"A" was the architectural letterform of leisure building in postwar America. Eager to stake out mountain and lakeside retreats, an entire generation of high-end homebuilders and weekend handymen found the A-frame an easy and affordable home to construct; its steeply sloping triangular roof distinctive and easy to maintain )almost no exterior walls to paint ). Fueled by A-frame plans and kits, the style became something of a national craze, with tens...