The Zombie Yeti blades look awesome- they really complement the overall look of the game's artwork. I had my tech over recently to add some mods and he installed the art blades. First he unplugged all necessary cables, (there weren't too many), then the two of us together removed the playfield from the cabinet.
He then easily applied the decals on to each side. We then smoothed them down and ensured they were straight and nice & flush. He indicated that he has also installed decals with the pf still in the game; peeling a portion off at a time but found it more finicky to do it that way.
When I do lift the playfield up now, I'm just more careful not to scuff the sides.
Another cool mod are Cointakers color changing speaker lights with the GB acrylic logo.