Metra dash kit for 2012 focus
It's one of the more innovative setups I've seen.
That said - it really only works as well as it does b/c Metra kept the OEM radio display with their kit and Ford includes steering wheel controls for the audio and BT streaming for the radio. (i.e. - you couldn't easily do something similar in a different brand of car or an older Focus - (well, Gen 1, at least)).