Wow! That look's pretty good! Almost like Kev's.
Coupla things - I think you need to increase the visibility of the panel lines slightly now - they look as though they are being washed out too much.
Also, whatever technique you are using to weather the metal surface- put the US insignia ABOVE the layer, so it isn't affected by it.
Also, you could and a dark line at the base of the spinner where it meets the engien nacelle, then maybe add some shading or paint chipping. That border is begging for a little more definition.
Keep it up! The shading around the ailerons and flaps looks especially good.