First of, I'd like to say that this is awesome man... many great electronics info comes from you.
But, I am wondering, Is there really a point for the 12 wires going to the VGA connector? You are using a COMMON Ground, and you really only need one wire from one ground to the connector, then you gotta connect all the (-/ground) pins in the VGA connector together, which is way easier then soldering 11 extra wires to the XBOX mobo, no less, which is greater risk of messing something up, if you arent great at soldering.
Please don't take this post to offense, I am simply asking a valid question and pointing something that maybe needed to be pointed out.
Also, I noticed you didn't use all 12 ground pads, but rather uses one for 3 or 4 wires... IMHO it just seems pointless to me when you only need one ground.
Thanks,
Dyer