Paul, you have moved the process forward by just showing the willingness to dialog. Thank you so much. I should give you a little background about myself so that you can be confident of what I am capable of understanding. I am, by trade, a recording engineer, so I am hip to the idea of signal flow, speaker powering and impedence matching, the independence (and dependence) of the various componenent parts of the system, and most importantly...when to jump over the rail and exercise the art of letting go. If I may, at this point, having all of the expense of this ahead of me, show preference for those things I really need, and work down to those things that I can do without, at least for now. First to go would be steering wheel control, Backup camera is a luxury, so for my purposes here we can disregard it, I have two critical priorities, and then the rest falls in. First, I need a head unit that tunes to Sirius XM channels, and it needs to have a screen so that all of the ambitious things that utilize the screen can be added later. Getting an adapter that allows me to use the current amp and speakers resulted from the idea that a new amp and speakers would be way more expensive. Finally, the entire project came about because the stock head unit isnt working. Replacing it will be a bit expensive, so boom---a project is born.