It's not improbable. They sure love to move giant stones around instead of, you know, breaking them down to make it easier. Some pre-civilisation architectures look pretty crazy.
I think they did this because it was easy for them, how ever they did it...[/QUOTE]
maybe its easy to transport mass in large chunks when you're using manpower, ropes, wooden rollers etc
like moving a 100 ton block probably takes less time than moving 10 x 10ton blocks