Perfect
The roof that became the origin of all roofs was perfect. It was tall and wide so it could fit and protect everyone. And the dimensions were perfect too.
Picture this absolutely perfect roof. They really got it right on their first try.
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This perfect roof was commissioned by Genghis Khan (かん). We got all of the carpenters and home makers and construction workers he'd conquered together and tasked them with making the first roof, but only if they made it absolutely perfect.
Genghis Khan was a perfectionist, and by conquering and bringing all of these different people together, he was able to create something perfect by all standards.