I don't buy the Orion's Belt hypothesis any more than the layout of the City on Mars. Do you happen to know the story of the origin of the third pyramid, the smaller one?
[Menkaure, also known as Mycerinus, ruled from 2490 - 2472 B.C.. He was king of the smallest of the three pyramids at Giza, and is believed to be Khufu's grandson.]