Last night and today removed, insulated, replaced headliner. Thanks to EL34's video got my headliner off in one piece with no serious breakages.
Applied at least one layer of 80mm Noico to every metal surface in roof including inside ribs. Next filled in ribs with double layer thinsulate. Attached a large one piece of thinsulate to ceiling (bottom of roof). Glued headliner sized pieced of MLV to top of headliner leaving cut out for small speaker in headline. Result three layers of insulation (overkill???) in headliner. Reattached headliner - all went well. Gratifying to be finished completely with sound and thermally insulating driver/passenger area. Next up - install floor: Neoprene to fill valleys, Polyethylene layer to isolate MLV from direct contact with metal, MLV layer, 12mm Okoume plywood, vinyl with rug on top, thick polyisocyanate any part of floor not exposed to walking.
* - Used mostly black but some silver Noico, not afraid to overlap layers.