For those of you who struggle or are afraid of trying to lay down decals on those uneven surfaces:
I just laid down the wing crosses on my D.i and used a decal setting solution from daco products. I opted to use the strong version and, it IS strong... within about 15 seconds the decals looked like they melted, so a took a cotton swab and rolled it along the decal in the direction of the corrugations, gently pushing out excess setting solution.
And it worked like a charm, looks almost as good as painted on, but be very carefull, the decals are very soft, maybe nxt time I will be using the medium or maybe a 50/50 mix of medium and strong.
I don't know if they ship outside of Europe, but you can always ask, I have met them several times onmodel show in Holland and Belgium and they are very modeller friendly.
http://www.dacoproducts.com/