I admit... I dig this project.
Have you considered translucent pop bumper bodies in Red, Clear, and Blue? I'll have a related couple of products to announce in a few weeks.
What about Frosted drop targets to replace those white ones with better lit versions?
Those look like Data East targets... rather than the standard Stern targets.
You could also Lollypop the standups in Red, Blue, Clear.
Just trying to make you're great pinball ... greater.
Oh yeah; +1 on the Pinsound idea.
Is there a Forest of Red Christmas trees somewhere?