XBIR NeoPixel is for controlling NeoPixel Ring and/or Strip with Xbox DVD Movie Playback Kit. It's for the original Xbox, but for other project with modification.
This project looks great! One thing to note, though, is that you can actually ditch that relay. The power switch is just a toggle for a GPIO of the Xbox’s SMC, which is very low power entirely off of the standby voltage rail. You’re not going to hurt the Arduino or the Xbox by just pulling the power signal switch signal low for ~10ms. The signal is active high, but we’re talking microamps worth of 3.3v current (5v on 1.6). You don’t need even need a resistor.