I'll get in touch with an old friend of mine, an architect I know, who was part of the team who designed the twin towers, and ask him. They were designed by a Japanese/American guy called Minoru Yamasaki (not sure of spelling -'Yamma' to his friends) who I met in Jeddah in the late 70s.

I haven't seen the clip on this thread, but I saw the one posted the other day.