So finally got around to working on the rest of the WRX wagon. The rear panels are a real leap of faith when you give them a big yank. Then more frustration awaits under the panels with the foam (nice foam by the way) and the white clips underneath. Take a close look at the design to help visualize how to extract them:
This website had some great reference material for removing the rear seat backs: http://www.freebmw.net/share/CarsBoatsBikes/Subaru/FSM/
We hit the spare tire well, most of the floor, the strut towers and the rear sill. We also slipped in a sheet on the fender behind the jack.
There is still some debate about bothering with matting under the rear seat cushion.
Next up is the front and rear floorboards. But this will have to wait since this really takes the car down.