+1 I saw a few issues with the construction as well. Particularly, onsite safety. Some of the methods and practices would not pass the Australian 'Worksafe' authority. Worksafe have their place but they really do slow the pace of construction.
I wonder if that was just a day at the office or if it was intended as a show peice for the expo. It required an enormous amount of manpower. Do they have enough work to keep them all going?
We also use cranes like that at work but never 7 at one time
I know of another company that imports prefabricated steel from China but they rarely get a job that all fits with no issues.