I'm back with new pictures ;-)
I finished the guitar body. I still need to complete the neck in order to complete the project.
Anyway, I painted the body and I assembled all the parts except for the neck.
I also installed in it 2 blue LEDs, here you can see how the body looks like in the dark:
Here you can see the body completed:
This is a detail of the "f" hole illuminated by the LEDs:
This is the back of the guitar. The cavity covers are kept in place by magnets, you can see them in this picture (the 4 white dots on contouring the spring cavity are neodymium magnets):
As soon as I've completed the neck I'll post new pictures ;-)