I enlarged the original design and add a compartment for a 9v battery in the base.
Once printed, I added two magnets to separate the 2 parts.
For the light, I used a 12V led strip with one led shorted to light it up with only 9V.

I also tried to create a diamond to cover led and connectors made of clear plastic and hot glue, I hope to do a better one.

The printed part was sanded, filled the gaps with spray filler and sanded again with 400 wet send paper, than primered in black.
Some paints will come.