Some of those pyramid stones were several tons. How would you keep a wooden frame from collapsing?
It wouldn't be an impediment for most of the stones in the Great Pyramid. However, there are plenty of examples -- such as the 200+ ton stones used for the Sphinx and Valley temples, and a 600+ ton statue of Ramesses II, which crushed one or more of the ancient moving men -- where the technique definitely would exceed the capacity.
Also, I remember stacking square wooden blocks when I was a kid, and getting them above three feet is challenging. With a multi-ton pendulum swinging from the wooden Murphy Mover, there's really not much chance that this technique would be adequate for lifting the stones of the pyramids.
My view remains that Davidovits is right.
http://www.freerepublic.com/focus/f-chat/1777639/posts?page=2#2