First of all, thanks for sending posting a reply on my Carputer for Altima Coupe thread.
Looks like you planned and executed your design very well. I am impressed. You mentioned you are going to school or done with school. Did you study engineering? EE prehaps? I only ask because from the forms you seem to have an engineering mindset. Or you have just done this many times.
I have a couple questions about your setup.
With your setup you have now.. are you still able to use the steering wheel controls (ie. volume, seek, and hands free calling) with your carputer?
Did you already have the stock XM receiver/antenna in your Altima before putting your new XM system in or was XM a new addition to your Altima?
Are you thinking about adding in a backup camera or other cameras into your system?
By the way... nice Weller soldering station you have. (seen in the background of your Phase I pictures).