The Egyptians started with cuboids before adding additional storeys with indents ( presumably because non terraced ones just collapsed) which led to stepped pyramids. There was a bit of trial and error while they figured out how steep the sides could be. There is archaeological evidence for a clear evolutionary progression. At which point did the aliens join in?
what do you mean about the pyramids being scaled to the exact dimensions of the earth and the sun? That sounds a bit iffy.
Just eyeballing those lines you could have them crossing every landmass if they were centred on any point in an area with corners in the balkans, Chad, Ethiopia and Iraq.
I assume you’re not serious.