i put my first one together that way then realised that at the back behind the ear peices Fett helmet has a little raise to it so if u put the inside peices in then cut the line out there is still a solid area with a bump just before the ears.
That sounded really confusing ill try to find a picture for ya
Actually if you look at sd68s' pictures he has a great one of the back of the helmet that you can see the area i', refering to