[El Sordo]

Once you've got the floor laid out, keeping the stones aligned is not an impossible feat.

Where does the 'center of mass' thing come from? That probably is just a coincidence. More likely it's just someone cooking the numbers.

[justshutupandtakeit]

Check the location of the GP and note that a longitudenal line through it goes through the greatest land areas N&S same is true with a latitudinal line W&E.

There are far too many coincidences when it comes to the GP. (And NO other.)

Lifting 20 ton stones over 400 ft. with unknown equipment does not sound very easy. Even today it is not easy and requires gigantic machinery.