I have been working on making the whole new WTC complex, the last time I worked on it was around April of last year, and I finished the 1, 3, 4 and 7 WTC towers, I had started the WTC 2 tower and completed everything except the top, here's a picture:
I tried doing everything as 1:1 scale as possible, even the slope at the top, and I didn't duplicate anything, too.
Anyway, yours looks pretty great, I like it.