You and everyone you invite to play on that machine are going to have to stare at that cab art. I know you have already spent a lot of time working on it, and I am not trying to minimize that effort by saying you should start over. All of the art is essentially sticker/clip art, with no unifying theme or format.
Look at the Spiderman art on the cab. Notice how everything is tied together, and the virtual absence of clipart.
If you have made up your mind about your art, you may just want to make the CP and bezel black, and just put stickers on it (you would save a lot of time, money, and probable headache later).
If you showed this too me 10-15 years ago, I would have commended you for how awesome everything is.
Cheers!
