If I were going to do that, the first thing Id change is the back of the car. I have a gen III Sable and it just looks dumb. It curves down to the point where it almost looks like the back of a new VW Bug. Its too rounded is my point. It would look a little better if I had a spoiler. It needs to be more boxy looking in the back to look sporty. The back should be raised up more than the front, too, just to give it a more sporty look.
Yeah, I thought about swapping the front end and drivetrain from a Jag S-Type R. Then I would mold the rear taillights and 18" wheels. Heck, the leather interior is pretty nice too. Hmmmm...... I think it would easier if I just bought the jag.