Recently I 'discovered' that an epoxy coating on the ceiling is extremely sticky the next day, when first some extreme dynamat was added, followed by the cbs lead foam sandwich.
For a headlining 'card' Chris made a grp panel off the top of the car and we have cut that in half longitudinally and covered it in foam & lining. It will fit above the strengthening frame. The frame is also covered in foams and the same wool lining, plus a thick foam on the front cross tube. It is all a tight fit, but hopefully, will give good insulation and appearance.
Sealing the doors and window frames is a much greater problem . . . .