Makes more sense to me than slippery Nile mud, Gordon. Not all pyramids are that close to the Nile. How you gonna keep the mud wet and slippery instead of drying out into concrete, Mr G?. Try dragging stone over dry mud/concrete and you'll learn something about friction. Unless you are going to work only in the winter or when the nile floods you are going to need to build sluices to bring water to wet the ramps. What materials will you use to bring the water to the ramps? Wood? - you have already said that there was a scarcity of that (not true of course). Gonna dig sand canals? Ever been to Egypt Mr G? Gets very very hot.

No way!