I'll bet your build sheet is long gone but you'll never know until you pull the carpet. On my car I also found a piece of masking tape hanging but mine was on the body just below the right side quarter window and that's about as close as I ever came to the build sheet that was at one time attached there. Some cars look like they were used for trash cans based on the amount of junk found under the rug....so happy hunting there!
A leak from the repeater antenna hole trashed one roof insulation pad and the headliner in my car. I used double layers of "Reflectix" all-purpose insulation sourced from a hardware store to make a replacement pad. This insulation looks like plastic bubble wrap sandwinched between two layers of metal foil and is usually sold by the foot. It's fairly inexpensive and so far has worked out great.
Photos from my restoration album:
Yes, the roof antenna wire routes to the right side of the trunk where the GE repeater is mounted on the radio board.