Very constructive

A few problems I see.
1. Your use of type is weak. The font is thin, plain, and not dynamic. Take a look at the art from other marquees... font selection & use of type is very important. Here it looks like an after thought. Many plain fonts would look great against this backdrop without alteration. Helvetic / Arial blown up "saturday-sale" style doesn't.
2. If you are going to use an acronym, use something that sounds phonetically interesting (basically your cabinet is now called wopper 2.0 -- that doesn't sound exciting) Why not just call the cabinet "Wargames" and don't tell anybody about its connection to the movie. The movie is so old few people will make a strong enough connection to see you blattently stealing the name & subject matter (remember, good artists borrow, great artists steal.) It's good stuff, so is the name. Wopper 2.0 isn't.
3. I would remove the "tic-tac-toe" screen. Taken out of the context of the movie (which MANY peole will not remember), it makes no sense, except in the hokey tic-tac-toe sense.
From a visual perspective, I think the backdrop art looks good. As far as printing goes... if you started with low-res art for the background screens, it won't print well, even if it has been blown up to 'at-size' 300 dpi. You have to count on the original size of your art to set the quality. If your screengrabs started at a decent quality, and you maintained that level of quality all the way through, your printing will be good.
I think what you have is a good start. Steal some concepts from other marquees you like, and blatantly repurpose them for your own ends on this one.