Here is the version 2 of my Joi Emanator. Included is the render that I am basing a lot of my design on, along with film stills, but this is the main source. I realized the inner "tube" was actually square, which combined with a square peg should make it a lot stronger.
Unfortunately it is now two halves instead of one, but this is again for stability and with this being a static prop in mind instead of something hollow for electronics. Its just too small to get into for LED's with this design, so it is something for me to keep striving towards.
I want to give thanks to Dave from TipTopWorkshop for helping to double check my work, and RPF user Sundowner, who I bounced ideas around with during the version 2 process.
Here is my version 1: https://www.thingiverse.com/thing:2630241
Version 1 is more appropriate for attempting a light or sound install, where as v2 was created with being a static prop in mind, or a base for casting.