I agree with this assessment but would add that it worth to do the boot, including the floor and lid. The most noticeable difference will be when you close the boot lid! You can also somewhat access the inside of the rear quarter panels and put a piece in there (similar to doing the inside of the doors but even tighter). 

While I have not done it, I wonder if it makes sense to put a piece inside the front fenders (after having removed the plastic fender covers).   

Read More...