Thanks -- had searched for info, but the "sail" trim threads are actually of the front window pillars. Have found any on the sail panels (= rear)?
The black rear interior panel with the grille is interlocked under the sail panels and with the black side panels. And it also goes over the hatch's lip (and the floor mat has to be out). And there are those white plastic clips under it too

. The exposed black plastic retainers came out fairly easily.
Any "lurkers" out there who have pulled out (and hopefully successfully reinstalled) this rear interior panel?