"Hey, guys, you know, this fricking stone is about a hundred times heavier than we have any chance of moving. GOLLY ARE WE EVER STUPID to have done all this work for nothing!!!
And in the last few centuries engineering often had to learn by having buildings fall down. They could very well have overstepped their bounds if, in fact, this is too big for them to move. Is it?
Are there any of at or near that size moved and in place? Or is it perhaps a lesson in the upper limit?