I plastered the downstairs of Lulu's dollhouse yesterday. Remember I also put in my wire tape for electricity before I plastered. The plaster is finally completely dry. At this time, if I was just going to paint my walls I would sand the plaster smooth. But I'll be wallpapering so I can skip this step. My wallpapering job will be very easy in this house. But if you are using complicated paper with places that need to match up you probably want to make templates of the walls with the window cutouts at this time.
I am framing my windows on the interior. I always put my "glass" on the exterior. To frame the 3 downstairs windows I used bits of wood I have left over. You can get thin veneer from Hobby Lobby and cut it into strips if you don't have thousands of strips of wood lying around like I do. : )