Framed the west wall.
Nailed a strip of scrap into the gap at the foot of the door to maintain dimensions while working.
More cross laps. Picturing the shack something like a three-walled card house, with the east (picture window) wall bearing less of the load of the roof than the other three.
House painters walked off with a roll of tar paper I was planning on using for the roof, so back to the drawing board there.