Rich Donnally helped me screw the rear window into place. He held the screws with a phillips head screwdriver, and I ran the small ratchet to seat the nuts. Just slightly snug, not tight.
Image 2 shows the seated nuts. Note the vinal sheet protectant still on the inside surface. I goofed and forgot to remove that sheet, and I could not peel it off in that space between the window's top center and the top structural rib. We had to undo our work to remove that plastic, then reinstall. Lesson learned.
Image 3 shows that nice black border the Sikaflex Primer gives on the inside surface of the plexi.