Bill -
Yes, it is incredible. Because they were going to end up with the same net amount of dirt at the site, any addition to elevation in one spot required a correspnding decrease in elevation at another spot. And vice versa.
It would have required much more detailed planning and forethought about where the dirt was going. You couldn't just say "shave this ridge" becasue the dirt you took out of the ridge had to find a home somewhere very close to where the old ridge once was. And that removed dirt raised a new set of drainage/strategy/aesthetics issues, and so forth across the entire site.
I wonder if at the Lido, because of proximity to Long Island Sound, they didn't use barges and conveyor belts.
Bob
BTW, at Athens CC for repair work they kept two mules and a barn just off the first fairway until sometime in the '40's.