May I be the first to congratulate you on a very nice job. Cosmetically, the thing is set up very nicely, and it's probably as small as you can make that arcade unit, no doubt about that.
May I make a suggestion, though? If you want that paint to last on plexiglass, I highly recommend roughing it up with sandpaper, putting on a coat or two of primer, THEN adding a few, light, segmented coats of paint. It'll look better in the end, and for your sake, last a lot longer as well.
Again, great job, and here's to seeing more of these arcade portables in the future! AYE!