mm... I just read my 1st post to this again, I'll confess it was excessively contemptuous and rude, but seriously... It's no secret, beyond the design of an architect, it takes above all the likely expensive skills of specialized craftmen to build such a thing in a proper way. Looks like it would all be made of limestone, à la bonne vieille parisienne, and it looks quite large,
like taking an entire street, so you'd need a lot of guys who can cut limestone materials properly. Obviously, forget about anything precast, it'd be intolerable. I'm assuming they would do it properly, then I'd be curious to see what it would cost. Maybe the price of a neat and shiny contemporary highrise. Maybe even more.
So I still can't see the point of it.