I didn't get quite so fussy about cleaning the roof, though I did with the old headliner material. I noticed that the edges of the fabric had noticeable indents where the perimeter trim bits had sort of pinched it.
I cut a roof panel from 3/16" paper backed artists foam board and did a test install with the perimeter trim pieces and marked exactly where they laid on my new foam panel.
I removed the foam panel and glued the old headliner fabric onto it.
The marks I had made on the foam panel helped make sure that I got the fabric on just right, so the old marks at the edges of the headliner fabric would again wind up hidden beneath the perimeter trim.
Worked perfectly, and I've now got some small degree of insulation up there as well.
Best part was the gluing was done outside the cabin on a workbench, rather than upside down inside the car.
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