Thanks, Grubby! I appreciate that! I'm still trying to tweak the bare metal look, since I'm not totally satisfied with it. But I think at this point, I may have done all I can do with it in Illustrator. What I'd like to do is add some random scuff marks and other variations in coloring as can be seen along the upper fuselages of the aircraft in the following pics:
Photos: Boeing 737-823 Aircraft Pictures | Airliners.net
Photos: Boeing 757-223 Aircraft Pictures | Airliners.net
Photos: McDonnell Douglas MD-82 (DC-9-82) Aircraft Pictures | Airliners.net
Below is a close-up of an unfinished USAir 737-300 that I've been working on to illustrate how the bare metal is looking at this point. I darkened it up a bit overall compared to the American 727-200. I've been debating over whether to give it a more reflective look by simulating some cloud-type reflections along the upper fuselage compared to how it is now with a simulated clear sky. Basically just stuff to reduce how "clean-cut" it looks. But at this point, with every addition I make in Illustrator, I have to consider whether or not the thing will even export out of Illustrator because of that irritating (and apparently unsolvable) "insufficient memory" error that seems to be a bug rather than a genuine error.