The high-tension power-line tower people have a better approach.[1] They have a way to make the tower segments self-align, using a square of cables that fits around angled guides atop the section already in place. So the helicopter puts a section on without help from the ground, and with no workers near the tower. Once the helicopter has cast off, workers climb up and bolt the sections together, and remove the alignment guides.

Ski lift installations are rare, but power line towers go up by the tens of thousands. So the power line people need a way to do this routinely and safely.

[1] https://www.youtube.com/watch?v=YdynKxCloUQ