Well done on all your research and I look forward to reading the book. However, I have to say that, whilst I agree with the possibility of small teams of workers (there's a chap in the States who demonstrated a technique for moving massive blocks single handed and a number of people on this forum were involved in a successful experiment to 'row' stones using levers), you still need the enormous amount of man hours to dig the ditches and raise the banks. You can't lever out a million tons of soil and rubble.
It may well be that smaller groups were involved in construction but i think you're still left with the need for a larger community to create the site as a whole.
Rupert