Like helicopters? I know what you mean, I just had to point it out though :)

Using drones would be interesting, but how situationally aware can you be flying one? With an overhead crane you can maintain sight line almost always, and when you can you have people flagging but you still have a good sense of location because of boom and line placement.

With a drone can you see how close your props are to the surroundings? I'm not sure how good they are at self leveling, but that's pretty important as well. There a lot of small but important details about dropping a line into an area you can't see so it does have some hurdles to overcome but is possible.

It would be interesting if it could be automated. Using beacons to locate where the load has to go then setting it to hit a certain altitude before moving over into position. Then you don't have to worry about someone looking at a screen or flaggers giving the wrong signal. If it was fast enough it could make up for not being able to lift heavy but do more trips instead.

Hauling sheets of plywood up to roofers or packs of shingles would be a nice simple way to do this without lots of complexity.

If you make the object from lego bricks probably.