You have done a fantastic job on this, and other people have pointed out the design flaws, so I will not do the obvious.
However, I would have done this totally differently.
The ghostbusters would have been the left image on the side art, they would have been firing their proton packs, the light beams would have gone across the kick plate and then on the right side, I would have had slimer or one of the other baddies caught in the beam and heading towards the trap.
The kickplate might have had the catchphrase I ain't afraid of no ghost or who are you going to call.
However, please please please do me a favour.
You have gone to all this hard work I am not sure what front end you are going to use for your cabinet, if you are going to use Hyperspin, it is very easy to create a skin for the main menu, and system themes.
I want to see a Ghostbusters front end, I want to hear ghostbusters sounds and not just the stock front end graphics that everyone uses.
People go to all that work, with their artwork and building the cabinet, and then it is just stock Hyperspin and to me it looks awful.
You obviously love ghostbusters, so go the whole hog and create a custom menu system for yourself.
Here is my attempt of doing just that for Space Invaders, but I might go for a Bubble Bobble artwork now, I am in two minds, Space Invaders was literally the first game that I played as an arcade game, bubble bobble has some great fun artwork.
I am not a graphics expert, but Hyperspin is so easy to make your own themes with a little bit of learning.
Regards
Mark