Watched the video. What I don't get is the following:
The engineers on the video are saying that have not seen many buildings with such a large interior space without any supporting structure. I suppose that's fine if the roof is properly built and there is nothing on top of the roof but: They said there were A/C machinery, tinacos and transformers. My SIL's house has a large living room and it's known that the roof above it is rather thin. Everyone knows you cannot put weight on the roof, so any construction (they have an apartment built up there) is on the part of the roof that is properly supported with vertical columns. This all makes sense to me, so what I cannot grasp is how come they placed this machinery on the roof of this building, with nothing supporting from below and thought is was a good idea? My BIL who has done all the construction on the house, is no engineer, but apparently understands much more of construction than whoever has had to with the building of Jet Set.