Well, it's understandable that everything is fragmented.. All bezels were initially intended to be used in a full-screen application. So it's uncharted territory.
If I find what I think is a nice 4:3 or 16:9 set then I could just make a layout option to toggle them off or on.
But, thinking outside the square it is possible to go much further.. cabinet images could be broken into further components; control deck, the part underneath that, leaving just the frame. Then, you could easily modify the look of these separate components and come up with further cabinets for various purposes, etc. Having some kind of full bezel artwork that ties in with the marquee, control deck, the part under that, etc could take things to the next level? Differentiating them further from the CoinOPs look.
It would be a big project though, would require a team. I'm not that worried either way. I'm already involved in two large projects in two other online communities which are 100% teamwork orientated. So, I don't have the time to get involved in another large artwork project at the moment, even if I wanted to.