I am in the process of buying a 2004 Saab 9-5 Linear Wagon. I am hoping to do an array of modifications but I want to start with the radio, I have read and seen a lot of people doing a tablet interface (linked below), I was curious have any of you done this before? How does it work if you have, what kind of tablet should I get? I was also curious to know if I don't do that will any universal radio fit? I really like the Linear Wagon but am also curious, how do you all feel about it?