I had a little spare time and decided to chop out a rear quarter panel at a local U-pick.
I thought folks might be interested what the skeleton looks like...
Rear AC is visible, here....
It' looks like quite a few little bolts to get at the unit, from the inside, cleanly.
Not quite certain if you have to take the whole unit out to replace it - I should have grabbed a shot from the inside. It looks like a -4 10mm bolts to get it out from there if I recall.