>>19099373This tracks with the technologies obviously used in the construction of the pyramids themselves. The absolutely fine seams in the rock, combined with the size of each stone, imply either a pouring method or in-situ machining with sub millimeter tolerance.
We've seen floating around here videos about 'ancient vase precision' (video search that term) that's beyond our present ability to replicate. Machining tools that complex really do weight probability towards good computers, too.