Nice Joe, I was thinking of add the Burj, but didn't get around to it. The wonders you mention (under construction) should have enormous build times, to represent the manpower and years they take to make.
A few more ideas (both existing, proposed and eventual0:
N - Airport Expansion (+1 Great Engineer)
Requires Airport
+ 25% Gold
+ 4 trade routes
- 2 Popularity in the city
W - Channel Tunnel (+1 Great Engineer)
Requires Public Transportation
+ 2 Free Engineers
+ 4 Trade Routes in this city
(Should be built by Paris and London, I imagine that is possible)