Very cool. I find everyone that trys to make their mustang model very fast cuts about every other corner in their build, so I'm wondering how it will look (and more importantly, fly) when done right. The last one I saw I think the fuselage was poorly constructed and it was starting to twist in the tail and disintigrate, but maybe it was just excessive fatigue and not craftsmanship.
.perfectionist-on
I really like the maintenance/access hatch touches on the elevators (that's insane, I would personaly do it in the paint and decal phase, but you're actualy incorporating it into the physical surface), they're a little larger than the actual ones (I wish the real ones were as lush as yours though) but I assume it's because it may likely have a practical purpose for being that way on your flying model.... and, with such attention to that detail (all my asuming here), I'm surprised you didn't notch out the trim tabs on the ailerons and elevators too.
PS - Don't forget you rudder (minus the v. stab) should be/apear fabric with a notch in it for the trim tab that should be/apear to be metal, too.

.perfectionist-off
Good luck, are you aiming to finish this up during this winter or pushing it through with another plan/e in mind for the off-season?