Well, I've been lurking on this thread long enough.
Everything looks incredible!
At first, when you widened the visor area, I didn't like it, because it didn't 'look' right. But after examining the source illustrations, I have to conclude that it is pretty damned close. You've done a great job, and if/when you decide to mold/cast these, I'm on board for a copy.
Question, though: Should there be two 'divisions' of the upper cheek, under the mandibles? It's hard to tell if McQuarrie was intending for the first division to be an actual separation, or if it's just supposed to be a shadow. There seems to be evidence for both.
Please keep up the good work!