Hi ya scumdog
I know yours is quite different, however I had the same problem with my '62's parcel tray. I undid all the fasteners and it still wouldn't budge. I asked the question and the extremely knowledgable Alan Tast suggested that the rear edge of the parcel shelf sometimes gets caught in the rear window rubber/sealer, and some carefull pulling and wiggling should release it. I haven't had another lash at it yet as the door openingas are all masked off and I can't get inide it.