I was thinking, if i were to go to the junk yard and get a spare rear deck lid to play with i could cut out most of the flat section and contour around the tail lights and form a sloping rear in the center of the car and i wouldn't have to cut into the uni-body at all. if i left a little bit of a lip for the air to slip off of i could probably get rid of 2 or 3 square feet of vertical area off the back of the car as well as have an easy solution to filling the holes left in my current deck lid from the removal of the rear spoiler.
anyway let me know what i am missing because this seems like a really simple idea.