The question is simple. How to create the curtain wall as seen on the image?
Nevermind. I just figured out that the only way is to create four types of curtain panels as shown on the image. So diagonal and secondary mullions (grey) of the curtain wall are actually part of the panel.
Well, looks like I was too optimistic. There are too many different panel types and they are not flexible, I cannot create something that is so universal that fits everywhere or at least more than two places. I also tried to build this facade up as in place wall, but that is also quite time consuming. So it seems that this kind of curtain wall which can easily be done even in ADT in minutes turns out to be extremely complicated task in Revit. Everything is wonderful as long as you do not try to create non-regular grid because then you are in deep ****.
Tell me if I'm wrong.