The obvious question is, how were such megalithic stones quarried, dressed, then moved and set into place by the ancients, who didn’t have access to the technology required to accomplish such a feat.
Not to mention that each one had to be cut, transported,
and set in place every few minutes to fit into the
supposed 20 year time frame given for construction.
Indeed, but don't bother egyptologists with any of these facts and logic. Their minds were made up more than a century ago.