Edge-Lit LED Text Engraving

I had just reach a point in my CNC router build (https://openbuilds.com/builds/fixed-gantry-cnc-router-with-old-industrial-supplies.6536/) that I could start using it to make something when it was time to make some gifts for Christmas! I liked the idea of edge-lit LED lights with a custom image or word.

I ordered a few bases:
2019 RGB Lights LED Lamp Base For 3D Illusion Lamp
https://www.dhgate.com/product/3d-night-lights-led-decoration-lamps-table/401916626.html
and a 12"x12"x3/16" cas