Cardboard Headliner

The sail panels are separate from the headliner and are held in with plastic clips. The clip slides/locks into a square of cardboard and that piece of cardboard is glued to the sail panel. So if you get frustrated taking it off, the small piece of cardboard will separate from the sail panel which isn't a big deal; simply glue it back on and then re-install the panel.

The headliner would be easier to remove if the rear and windshield gaskets are out.