Hi Cesare,
I have the same kit, and looking at the colour HobbyBoss suggest does look a little to dark IMHO. personally myself I would go a little lighter on the gray, maybe mix a drop of white into the Gunship Gray.
Considering thier was only one N/AW A 10 built, I have found several photos where the gray looks darker in some pics and lighter in others. Whether it was re-sprayed at different times or if its just different weather conditions affecting the colour we see I don't know .
Andy
