They are the architect, not the builder. The builder is ultimately who chooses which materials to use on the building, no?To everyone saying variations on 'this will come down to the materials': when have G+C ever done anything good? They used curtain wall on Aura and it still came out complete dogshit.
Even Kirkor and E.I. Richmond manage to do something passable once in a blue moon. I'm unable to think of a single G+C exception.