Did someone mention doors? Oh, so close. I finished filling and spot priming the interior of the two doors. They are now deemed worthy of interior top coat paint.
As for the door opening on the cabin top, I primed the right side. I then applied glazing to all the imperfections on both sides, sanded the glazing and applied another coat of primer. We'll check the results tomorrow but I think after a light scuffing with a Scotchbrite pad, the fiberglass work should be done. Of course, I still have to install the windows which will require more fiberglass work. But that will be another day.