Nice deal you found there. I just had an Alpine headunit and interface installed, and they just stuck the unit behind the dash to the left. I can maybe get some pics for you tomorrow if you would like.Got a New Head Unit/ iPod Interface for Christmas!
As for the iPod they just ran the cord out of the dash, but tomorrow I'm going to drill a hole in the pocket of the mounting kit, and run the wire in there, plus it is a nice place to put the iPod.
Good Luck on finding the harness