The steel skeleton is almost complete. As the frame expands and the space for the crane to operate contracts around it, I bet the builders are applying some lessons learned along the way. In order for the crane to deliver pieces to far corners, it needs room to move. If the nearby steel gets too tall too early, it'll be blocked from being able to reach. I bet there have been some interesting oops moments along the way for some of these guys.It reminds me of listening to an elder aircraft engineer who worked on at least one military plane before computerized design had arrived. He said it wasn't uncommon to find that two components would be accidentally designed such that they would occupy the same space in the plane; not gonna work very well. I'm sure that, from time to time, building construction runs into a similar gotcha.
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