A steel-skeleton structure wouldn't last even for a century, but a wooden one could stand for a millennium if only proper repairs were made, Sato thought as he insisted on a pagoda of wood being built. The temple was designed by Yoshio Yonehara, a former head of design with major general contractor Taisei Corp., who had worked on traditional architecture projects. [...] Yonehara decided to use copper roofing instead of tiles, which could break when water freezes in the winter. He also chose not to board the floors beneath each layer's railings so snow would filter through to the roofs below. Yonehara set the pagoda base at 2.4 meters to remain above the snow cover, which reaches a depth of 1.8 meters on the temple grounds in a normal year. He also had 24 29-meter-long piles driven into the ground to firm up the soil.