There is nothing revolutionary here, just wanted to add my variation on the theme. I wanted it to look as OEM as possible. I think it turned out real clean.
Dremel with shaping bits
USB 12v power adaptor
hot glue gun
about 1.5 hours total time
Step 1: The USB power adapter
Step 2: The Console face
Step 3: Preparing the blank
Step 4: The USB device
The last picture is the dry fit before I glue it in.
Step 5: Installed in the blank
Then, I called on our good friend, Hot-Glue, and sealed everything in tight. Since this was deep, I made several small applications around the PCB to make sure everything was secure.
Step 7: Power Connections
In the fourth picture you can see how I plan to attach my power wires in-line with the existing wiring.
In the last picture you can see that I have soldered the wires together and have the shrink wrap already for assembly.
Step 8: Reassembled!
The red LED lights up when powered up and looks very clean. The picture is a little blurry because it was dark by the time I finished. I will post a day-light pic so you can see it better.
I hope this has given you ideas for where you can easily place a USB power port in your car!