I made Sega Rally (1995 arcade) playable in real 3D VR on a standalone Quest 3. Not a flat screen in a virtual room.
Recorded straight from the headset (the tilt is me looking around).
The arcade's own 3D world is redrawn for each eye with a custom Vulkan renderer: real depth, head-tracked cockpit, 120 Hz, HD textures. Everything runs on the Quest 3, no PC.
GitHub coming soon, link to follow it in the comments.