I have to second the recommendation for the Mega Bezel project. If you're dealing with emulators like MFME where every fruit machine has a completely different native resolution, getting a one-size-fits-all bezel is pretty tough. The Mega Bezel shader pack (usually run through RetroArch) dynamically scales and even adds screen reflections, which makes it look incredibly authentic without having to manually size every single game.
In modern digital gaming, the UI and borders are usually built to be responsive and scale automatically for any device—something we focus heavily on with our own mobile slot and card games. But for retro simulation and preserving these classic fruit machines, setting up those dynamic overlays is definitely the best way to recreate that real physical machine vibe on a modern monitor.
Hope that points you in the right direction!
