Now that the first floor flooring is done, I moved on to the kitchen. Because this dollhouse has identical left and right walls, I was able to use the original paper template of the living room left wall, to wallpaper the kitchen right wall. Take notice of things like this, so you don't have to spend time creating a new template when you might already have one on hand.
I added more trim to the living room. You can see how I will be adding corner trim to the rooms with the placement of the first one, at the far left corner. This hides the gaps at all of the corner joints caused by the templates.
You can choose any kind of trim you want for these corners. There is no wrong or right way to do them. It's all based on personal choice. You can use round dowels, square dowels or any width strip wood. I placed them with the wide side against the side walls but you can place the wide side against the front wall if you wish.
You can place your corner trim before you place the baseboards and ceiling trim or you can do it afterwards, like I did. Regardless of your choice, just make sure you do apply corner trim. Do not try to hide the corner gaps using wallpaper strips or spackle. Those options will not provide you a nice, finished look. Strip wood is the way to go.