Sounds epic. Start by ripping apart a cheap AR headset kit and replace the built‑in camera with a depth sensor, so the costumes actually track movement in 3D. Hook the projector to a Raspberry Pi that runs an open‑source game engine like Godot; it can mix live video feeds with your hologram assets in real time. Use Bluetooth beacons under the stage floor to sync the dancers’ positions with the audio, so the music shifts when someone moves a certain way. For the crowns, mount tiny LEDs on a flexible strip that reacts to touch—every crown becomes a tiny light‑show that follows the performer’s gestures. Finally, fire up a simple WebSocket server that streams the narrative script to a tablet on stage; the audience can tap to reveal hidden backstories, making the whole thing feel like a living, breathing opera. Just remember to keep a spare battery pack handy—you’ll never know when the lights go out.