hey,
I've been following this thread o so quietly for the past 3 to 4 years now and I've used this thread a lot as a reference for one of my levels (I'm a game developer / level designer / artist). I thought now that the level is done and the game is close to release (free for everyone who owns Steam/Half-Life²) I'd show some screenshots here. As you'll see I based it off of One World Trade Center the way it was about 8 to 10 months ago.
You can check out more images on my site if you are interested:
http://www.wesleytack.com/
And for those who play games and have Half-Life² installed, you can check out the free modification here and play it yourself!
http://www.moddb.com/mods/off-limits
On the real building, when are they going to start adding the cladding downward? Are they not doing this on purpose to avoid colliding with it as the ground crew keeps working around the tower?