Custom auto body shops hire some of the best airbrush artists in the business, you could start there. They'll be able to paint a case and etch acrylic Windows, no worries. You could also try the art dept at a local University or design school, some of those students can do fantastic work, and may do your case/window relatively cheap if they can add the photos to their portfolio.
There is also mods to the case that can be done, like cutting custom designs in the non windowed areas, adding led glows behind tinted acrylic, like a glowing nuclear symbol over the front fan meshes etc, which maybe out of the realms of your ability, but not necessarily others, its just a matter of deciding what you want, and then deciding who can best accomplish the task.
A certain amount of thinking outside the box is required, but the end result will be a unique case that will definitely stand out in a crowd.