The answer to "How did these Ancient People do this????" is basically always
1. A lot of dudes. Just a ton of fucking people from beginning to end of the process.
2. Ancient people weren't stupid, they just figured shit out the same way we do: fuck around until you find out.
3. We're gonna plan this out and it's gonna take ten fucking years, and you will cope.
4. Sticks and string are surprisingly versatile and can be used for a variety of purposes, like moving stuff and making sure things are even and go in the spot you wanted to put them in!
5. I want to make this easier and more efficient to move. If I put this on the round thing and push, it will move. If I put this in water, it will move. If I get some animals and rope and have a whole bunch of them drag it, it will move. All of these things are a better option than one guy trying to pick the whole fucking thing up.