Hard edge on a Fausto de Martini model

Hi to all, my name is Massimiliano from Italy... Sorry for my english!

In these days I'm studying a spacemarine model made by Fausto de Martini and I try to replicate his work on the hard edge. Here it is a little reference:

http://imageshack.us/photo/my-images/829/testgk.jpg/

My problem is: how he did the hard edge on the yellow dots? For the main contour I think that he use a bevel but for the yellow points I can't see any control edge loop and for sure he didn't use any hard edge weight tool (I think that he use a n-gon to create some support edge but if I try my surface is a mess, not neat and clean as in the reference image)...

Could you help me?

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