Advise needed - Engraving a pattern into a solid.

 From:  amur (STEFAN)
8160.9 
Hi Marco,

thank you very very much for making a detailed tutorial! Very much appreciated! I had tried so many things and have not thought about trimming the large surface. I also tried to offset the surfaces in both directions and then lofted them, but could never get a solid out of the large surface! Perfect how you did it.

Thanks again!

Best regards
Stefan