I had already thought about this, but I'm not sure what you would be connecting to inside the iPod to send to the DAC. As far as I understand coaxial cables, they're just two wires, one sending and the other returning electrons. You'd have to tell from the WM8975/8971's schematic and pinout to see what needs to happen.
According to the datasheet,
pin 1 is the master clock
pin 2 is the digital core supply
pin 3 is the digital buffer (i/o) supply
pin 4 is the digital ground (return path for both pin 2 and pin 3)
pin 5 is the audio interface bit clock
pin 6 is the DAC digital audio data
pin 7 is the audio interface left/right clock/clock out
I don't really know what this all means, so you digital audio fanatics are going to have to decipher this.
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