The trim pieces supporting the headliner are now fastened. The section at the rear is now installed. The entire headliner is totally supported by resting on supports at the perimeter. It will not sag because it is bowed. I posted my progress at the following site
https://picasaweb.google.com/barthhc/Headlinprog?authkey=Gv1sRgCMG2o5Hvxd-OpwE#A transition piece of moulding will be added where the 2 headliner sections meet at the back. The panelling over and to the rear of the front doors will be supported by the screws fastening the windlace.
I am not sure how far I will extend the panelling down the sides. I am also considering adding lighting in the arched openings at the top of the sides.