I keep thinking about doing this, but not having a fixed marquee, but instead display the game in the middle of the screen, the marquee for the game in some of the unused space at the top, and the control panel layout and maybe the instruction card at the bottom. I figure for a 1080x1920 display, for vertical games, the game should take up an area of 1080x1440 leaving 480 pixels of vertical space. The marquee could then be 240x1080 at the top, and the bottom could have control layouts (I was thinking maybe the original control panel, the contols as mapped to your control panel and maybe the instruction card.
For horizontal games, there would be a lot of extra pixels left over, (the game would only be 810x1080) and it might be hard to use up the extra space, and I would want the monitor to take up almost the whole width of the bartop, so the bartop would be pretty narrow (a foot or so in width)
I still need to finish fixing my old upright cabinet that I pulled apart partially when I moved 5 years back, and I don't feel I can start a new project until I get it back in working order.