I'm having a bit of trouble being a good photographer during this process. Here I've screwed in the plaster washers, covered with drywall tape, and done two coats of plaster with sanding after each. After that, came more batten.
The batten is 2/3 of the way up the wall. The battens are about 14" spaced around the room. I wanted the spacing to be centered under the windows, so the widths are adjusted for each wall. My dad did the math to lay them out. It helps having an engineer handy!
This is the wall where the head of our bed goes. On the opposite side is the bathroom, scene of the aforementioned sledge hammer swinging.