Thanks Alan, Didn't photo any of the steps, wish I would have now. The front metal and rear metal trim pieces hold it front to back. It is just inserted under the metal strips, not screwed thru the plastic. The sides are held in with the rubber weather stripping. The weather stripping is tight enough to hold it in. I used Camie 397 headliner, trim and laminating adhesive. Got it from a wholesale material store in Pittsburgh. He said it was what most of his auto interior shop customers buy.
