Laser cut your own LED illuminated stand-up display with underbody lighting
For the installation of the sign you can integrate your own switch into the design or simply use a standard switch with the dimensions 17x13mm. For the illumination, just somehow stuff a led strip into the box and fix everything with hot glue. Solder the switch somewhere between the plug and the led strip controller.
It is also possible to 3D-print everything btw.
Have fun :) wirte me if you got any questions