Hi,

No, I talk about the step before. My bad. I can't get the thickness of the body.:

"Here I Extruded the edge shape inward a little to get depth, I used a line to guide the direction of the extrude to 45 degrees where needed.
You can also shrink all of the port shapes (copies of them) inward and perform a Loft between the edge curves and the copy.
Join these new walls to the body. Try to Fillet them to get a nice "punched-in" contour."

http://moi3d.com/forum/get_attachment.php?webtag=MOI&hash=c16cad76a239d19240c369df9a670679&filename=mix_015_08_extrude-join-fillet.jpg



I'm not sure if I didn't understand what he means or if I did understand but it doen't work because i did something wrong before..

Thank's for your help !