> Sorry for my rambling on...
That's fine ramble on. So in your idea the counter-weight would run of water instead of sand which means they'd have to carry a lot of water up the slope from the river.Unless they had some manner to conserve and reuse it. Why not use sand which is readily available?
So where do you believe the tracks for build the various pyramids ran?
Using the contour map of Giza which shows the location of the quarries how do you feel the condition were met for Khafre's?