Ok so before you reply it can't be done, please refrain. I believe that it can be done!
Most of the replys to threads like this say that it can't be done because of the size and then also because of the Can-Bus system in the JK. I have a 2010 head unit being shipped to me (hopefully will have it this week). The size of the unit I know is larger than the TJ and I will work with that once I get the wiring figured out. I have the connector to fit the factory TJ harness to wire in an "aftermarket" head unit.
1) I need to figure out the best place to get the factory harness end that plugs into the JK head unit???! I have seen them online from a couple places for around $30-$40. Seems a bit pricey, so hoping someone here can point me in the right direction.
2) If anybody has the wiring diagram for the 2010 (130 unit) that would also be helpful.
3) Lastly, If you have any productive feedback, and/or personal experience that would also be appreciated.