Sorry it's taking so long. :-)

I hope to have finished example Arduino code, prototype assembly instructions, and prototype bill of materials within the next week or so if I'm lucky. That might be enough on its own to get you going.

Then after that, the next step is a custom "sandwich" PCB board to connect all the parts, instead of using a bunch of jumper wires, and a custom housing box for housing all the parts, to turn it from a messy prototype assembly into a buildable kit.

First version of the firmware will be Bluetooth A2DP audio and AVRCP controls, but no track titles on the car's screen yet.

Assuming that everything above works, and I can find the correct commands to get this chipset to send track titles to the car screen, would you be interested in helping with the necessary empeg-side code to get it to spit out parseable track metadata on the serial port? I think you'd be able to do that part much faster than me.
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Tony Fabris