^^ Nothing wrong (at least IMHO), but indeed originally it was planed to cover-up the steel frame of the roof on the inside (e.g. like the roof of the Matmut Atlantique stadium in Bordeaux, etc), which was abandoned later for financial reasons. And I doubt now they will do it in the near future. dunno
I was making this reference in a general sense regarding stadium projects - what you see in the sexy images at the start, isn't always what is there on opening day and often it has a lot to do with dreaded 'value engineering'.
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