Wait...that's not an etch...is it? It's super clean. Tell us great one...how did you do the rate art?
Yep, it's an etch. I got a bit lucky that the enclosure was in decent shape under the powder coat. Sometimes when you etch away that much material, you can see a lot of inconsistent color (or scratches) on the enclosure underneath.
The rat art was, like always, laid out in Adobe Illustrator. The text was just a matter of finding the right font. The image I found on Google search. I traced it in Illustrator which converted it to a vector. Generally, etching pixel based images like JPEG or Bitmap yields somewhat poor results, so the conversion to a vector image is important.