Just print the parts and glue together (I used superglue and activator). Then paint to your liking.
I also added 3 leds on top of the billboard for added effect. Painted it with regular acrylic paint from an art store.
@JamesHofmann_76667 made this in HO-scale for his model trains, check it out here for more information: https://www.printables.com/make/3212114
The author marked this model as their own original creation.