So we finally finished up the doors on the WRX. The carpet padding took way too much time as a lot of the material installed actually had to be removed to make sure the inner panels fit back on the doors correctly.
The last door to do was the driver's door where we doubled up the layering on the sound deadener. The door weighs more and more importantly does not ring when you tap on it. Road noise at the doors is greatly reduced. But you can still hear a lot of tire noise through the floor.
The next stage of the project will be pulling up the floor to install deadener and carpet padding.