That's a really nice build. I guess I'm a little late to the party with lighting suggestions, but you could make a light diffuser from acrylic rod. Inset an LED in each end, and buff the surface with fine steel wool. The light will refract evenly inside the rod and exit anywhere there is a scratch on the surface, like where you've buffed it and put millions of microscopic scratches on it.
[attachment=7488:light_diffuser.JPG]
[attachment=7488:light_diffuser.JPG]