Summary

Made for a 5cm diameter lightsaber at least 22cm wide. Back has wall mounting brackets, space in four different spots for Arduino Nano as well as easy cutout for the USB port, the large central cavity can hold LED strips on the walls as well as light diffuser and a reflective rear panel. A magnetic reed switch can be mounted and used with my code to switch between 10 different colors.
https://gist.github.com/Flux83/5f0033c498fb058808437dcdda43121e

Updated files to center the lightsaber.