I had to remove C-pillar trims, trims on both sides of rear window, and after that I was able to slide the shelf forward a little, just to be able to put the nuts in place.Bnone, your install definetely looks nice and clean...
but how did you move the parcel shelf?
No concerns with drilling holes into the metal piece?
No concerns of drilling the metal piece as long as you stay away form the glass.
Actually, if I had had something like this, whole thing would be mush easier to do because I wouldn't have to do anything with the parcel shelf, just have to drill the holes and install the rivets, that's it.