I don't see why I should make it lighter where parts of the aircraft "bows up (or out)" because these models do that anyway. When looking around in the skin view or in the game you can get different reflections from different angles, from the front (depending on time of day and direction you are heading) the wings "light up" only at the high part of the wing (the part skychimp has lightened up on his wings).
And I usually only use about 7-8 layers because PSP7 only lists 10 and any more than that disappear unless you re-arange the order or delete some layers. (There is probably a way to vew all but lets pretend there's not so I don't feel like an idiot:) )
Tex what's your e-mail and i'll send ya the metal layers