I added a couple of lights and a spotlight to the global illumination of the board.
The upper left corner was very dark but is now nicely lit. I'll probably need to put a light shining between the flippers as well, since that area is really dark if the room lights are turned off, for instance. I want the machine to be able to play in complete darkness and fully light up the playfield on its own!
I also need to fix a better switch solution for the center VUK. It's not very reliable at the moment, I'm afraid.