the great pyramids consist of over two million, very heavy blocks of stone. with the other two who are roughly the same size, this makes for six million heavy objects needing lots of trees. i have no idea how long you can use a tree trunk like this before it's unusable. you probably need several trees per stone block.  doable? that's a lot of trees which are hard to cut with fucking copper axes. people have no idea how shitty it must have felt to be a lumberjack before steel axes became a thing.
Germany