This isn't nearly as pretty as the front, but there's some things worth noting here.

There are four cables that connect the LCD to the iMac:

DisplayPort

Temperature sensor

LED backlight

LED backlight sync

The key thing to note is that there's no special shortcut from the LCD to the external Mini DisplayPort connector. The signal will need to go through the logic board, so you'll need to have your iMac powered on if you want to display from an external video source.