Dissecting ipod base plug?

Ok, this is going to take someone who really knows what he'd doing when it comes to ipods and wiring to figure out. I'm told that there is a way to get audio data from the base plug of the ipod (I don't know what else to call it, but it's the plug in the bottom of the ipod, i.e. not the headphone jack). Does anybody know how to do this? Here is what I want to do.
You can see here the coin tray below the wood below the head unit https://davidson.smugmug.com/photos/19601680-S.jpg (you can also see my seriously fingerprinty center console panel, I had just replaced some vacuum elements, give me a break).

I want to put a base plug wire in the bottom of that coin tray and epoxy it in place so that just the metal plug part sticks out. Then I want to have wires going from that plug to my cig. lighter to charge the ipod and going to the rca's coming off my head unit's aux input to get the audio to go through my car speakers. This way no cords will show, and I'll have a dock built into that coin tray. I think this will be pretty cool, especially with the new black ipod.

My hang up is understanding how to get audio and charge out of that port. I'm guessing for the charge part I can take whatever is in the power cable that charges the ipod, splice it to an ipod car charger, cut the cig. plug off that car charger and splice it into the wires that go to my cig lighter. But does anybody know what a dissected ipod cord looks like? And what does what in it?
Thanks,
Richard

    If you're talking about the cord that comes with the ipod, with a USB end.... I doubt that you can use this cable for anything other than charging your ipod.

I made a cable that I use to charge my ipod through the 12v in the car, and output to my amplifier. It's kind of a pain in the ass, and I wouldn't reccomend it if you don't have experience soldering small contacts. It would be a lot easier to modify existing accessories to do what you're trying to do. try hacking apart a car charger/audio out acessory.

-j

Actually, I found a product called the Blitzsafe UII that has an ipod dock connnector on one end and dual-rca's and power cords (one switched power wire, one ground wire, one constant power wire) on the other end.