Battery operated lights and painted on letters.
I made this from some pieces of 1x3. I tried to joint the edges with a router, need a little more work on that technique. YouTube videos made it look soooooo easy. Jointers a little expensive and so are planners. I do plan on having those in my shop one day, but until then, I will keep practicing that technique.
I printed letters from the computer and traced them out on the board. Then used black paint to outline and green paint on the inside.