Wow, a decent install into the same dash as my 2000 SL2. Time to take these pictures into the supposed professionals and ask them to fix mine yet again.
My first install seemed nice, until I used the unit as it is, a pull out stereo. It broke their mounting, and so they fixed it this time, by somehow restricting the heater control to only go to the mid point. I still don't quite trust myself to fix it with as weird as the Saturn dash is, so they get one last chance on their "Lifetime warranty".
It also confirms that a second head unit in the dash will be possible, but with some work.