A time ago I saw Phil Ruston’s case for his V6Z80P, and it’s awesome. It’s cutted from 3mm acrylic and looks just perfect. Fortunatelly Phil wrote who made it: Razorlab. You select a material (from cardboard to acrylic) and upload your design – they cut and engrave final piece. You can draw your design in AI, Corel Draw or Inkscape very simple – blue line is cut, red line is engrave (and don’t worry, Razorlab has an extensive manual). So it looks like there is no reason to leave your designs bare. 😉