Last night I was able to get two things completed. I took a double sided av cable and converted one end into a 3.5mm stereo output jack. The other end will be cut off and soldered to the audio points on the motherboard. This will work as a headset input built into the xbox but will also be where I might plug in potential custom speakers. I also extended the DVD power cable to about twice it's original length by using IDE cable. I did this because the DVD drive will be outside of the xbox.
3.5mm stereo output jack:
Extended DVD power cable: