Best of luck! We just finished renovating our
Trillium, and the headliner was the WORST part! We used 3m90 which held up in the florida heat perfectly, no need for any hot glue. The seams were our arch nemesis. Since it was a shell, like yours, we had no track for any t molding like many use. We ended up using a cotton cloth like canvas strip with vinyl adhesive to cover the seams. Looks a lot better than the wiggly plastic tmolding lol