Looking at the panel lines, I think you're letting the application dictate the look rather than making the panel lines look as they are. Of course this is an artistic decision, how you want it to look but I can't help thinking the effect was applied out of expedience. Your line drawing shows a HUGE deal of detail and research. It seems a shame not to apply that same level of detail and research to the shading and surface detail.
Take a look at these panel lines-
Notice how some of the panel lines are very slight, and are overlaid, not huge gaping trenches. Save that deep trench effect for the panel lines that do have that effect.
Also check those fasteners around the fillet, you've got them embossed like round head screws but they are flat on the real thing.
You've got a wonderful start, great ground work that promises something VERY special. Instead of letting Illustrator do the work for you, you should take control work it yourself. Keep looking at those photos and they'll keep you in the right direction.
Your rivets are very nice by the way
I'm sorry if I'm out of line here and it is how you want it to look, this is just my opinion based on what I think you are trying to achieve.