Ever been trying to build a tall building and forget to make scaffolding or run out of iron or sticks or is the only thing you do is "pick things up and put them down" well here's the thing for you.
Cranes
Its pretty much what you would think a type of large machine to pick things (blocks specifically) up, move them a bit and, put them down.
I purpose two cranes: A tower and a gantry crane both need EUs supplied at least at a constant 512 Eu/t with maybe like a million storage and be made with some combination of iron scaffolding and cables made somehow and pick X amounts of blocks off of scaffolding and can move and place them with cables and similar items but the difference is range Tower Cranes range is more of a circle (which as I'm typing this would make it difficult to place blocks unless they stayed oriented the same way) and gantry more of a rectangle (useful for bridges or roads)
this is just a rough idea but i'm just throwing it out to see if it would be remotely possible although the tower crane would look cooler the gantry would be more practical and minecrafty.