Maybe raising a horizontal stone just the way he did raise the one on the video, by inserting wood underneath, a little at a time. Then, having raised it 3 mete

Maybe raising a horizontal stone just the way he did raise the one on the video, by inserting wood underneath, a little at a time. Then, having raised it 3 meters high (Yeah I know this is a lot) he could use his technique to roll it on the side to get on top of the two others. Just a guess.