The end helmet

I'm finalizing the helmet with the latest details and I'm stuck with 2 problems are:
-Orejetas Hull: project leaves me the sketch on the surface.
-Relieve On the inside: I do not know how to proceed to make a relief that begins with a depth of 0.5 mm, most of its length is 3 mm.. deep and ends 0 mm.
Greetings and thanks.

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