Did this one a couple days ago. Installed a USB port into the back of the otherwise useless cubby hole and ran the plug to a USB charger in the glovebox 12v socket.
Goes GREAT with the Scosche Magnet mount I put in. I love that thing...
The only snag I hit was that the back of the cubby hole trim piece is the mounting spot for the keyless-remote-receiver. I cut that off and essentially zip tied the receiver to the USB port I installed. Pics upon request.
Next step is relocating the USB/AUX port to the glovebox...and finding something to fill the hole.