OK, here's one: the course labor was performed by Chinese men who lived in caves on the side of the mountain while the work was done.
There are in fact lots of caves on the side of Lookout mountain, and I witnessed, as a 7 year-old, a cave in which people were living,complete with electricity, not far from where I grew up (across from the 17th tee). That would have been 1963 or so. So there is some evidence that such an occurrence was possible, anyway.