Have been emailing Charlie about this machine out of curiosity, mainly how did he do the graphics on the playfield as that is normally one big challenge. This is what he had to say.
"Godzilla was printed directly on the playfield, then coated with water based Varathane. I will warn you that it takes an insanely high end press to accomplish this (translation: really expensive) unless you work in the print industry or know somebody, it might not be cost effective. I'm lucky that's my day job! :-)
Ben Heck did his Bill Paxton game with a vinyl decal with a nice glossy laminate. This is a much more affordable option really. I'd recommend 3M micro comply (IJ180C). There are 2 flavors of that vinyl, a big channel you'll see, and one you won't... do not wet apply that stuff! Air works out by itself with dry application.
Hope that helps.
Charlie"