I don't understand why aren't they using a scaffold tower. In my opinion, they would finish the building faster, and also the workers would be safer. When I was building my house, I rented a scaffold tower from petesuen.com. It is a universal instrument, so I think it is worth buying or renting one. For example, my laborers used it to build the walls and the roof and paint the walls inside and outside the house. Most of all, I like it because it permits me to work on heights easily and safely, so no one can hurt something.