I purchased an amazing Paper Art from @PapperoniStore on ETSY. 

Made it in a light box frame, but did not want to have an external battery pack visible. 

Cut a hole in back of box, inserted Recess plate,  routed cables, neater installation.

My particular design is shallow on purpose, so the on/off switch protrudes from back of frame, so to turn off power, I jut push frame against the wall slightly. (Prevent having to remove frame every time)