Sony Xperia Z charging car mount

This is an extension of Sony Xperia Z car mount (http://www.thingiverse.com/thing:84674) with a built charger and NFC tag holder.
I used the NFC tag to enable/disable functionality as I have multiple chargers and want a different functionality in different places. I normally enable bluetooth for the car hands free and start GPS navigation.
I used a mini USB port as it seems to be more available then micro ports and I have plenty of mini cables lying around.