I have a 1994 35' pusher LandYacht and had significant roof leakages that caused the foam-backed headliner to separate on the entire coach. After completely stripping the roof and re-caulking, re-riveting, re-sealing and applying a liquid EPDM coating the leaks were fixed and I turned to the headliner. Like you, I quickly found that apparently the headliner (and wallpaper) is applied prior the the installation of any/all of the interior components...not just cabinets, but also walls, pocket doors, shower, etc. I also had damage to the plywood that the headliner is glued to. I tried re-gluing but the foam being deteriorated caused the contact cement not to work. The only practical way to "fix" the headliner I was able to come up with was to use wood (in my case oak stained to match the cabinetry) to fabricate a bunch of "support pieces to "hold-up" the existing headliner. I used strips around the perimeter that I screwed to the walls and cabinets. At the seams on the ceiling, where the vinyl strip is pressed into the seams of the plywood, I made a faux "beam". I used a 4" wide piece of 1/4 in oak plywood and made some strips that had a groove to overlap the plywood that were placed on each side. I drilled holes in the strips and screwed them into the ceiling (after repairing/replacing) any damaged plywood and used hole plugs to cover the screws. To help support the field of the headliner between the faux beams, I used some of those screws with the plastic cover and arranged them to form a nice pattern. I also had damage to virtually every plastic frame around the roof vents so I also made new wood frames the fit over the plastic ones. I must say that it was a lot of work (i.e., some advanced carpentry), but the result is actually quite nice and I like it better than the original effect. It has also held up very well to travel and use.
If you still want to use the rigid material you mentioned, I believe that you will end-up needing to cut them to fit around the cabinetry and, like me, fabricate some support strips to hold-up the edges. The screws with caps should do the trick for holding it to the curve of the roof. To help get a flat surface you will need to cut the vinyl seam strips where they meet the cabinets and pull the part out that is in the coach.
Good luck...it's a big job no matter what you do!
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