With regards to templates:
Currently, if you place an item in front of, say, a window, the hearthlings may end up placing that item before a window is installed. (i.e. the flower boxes, crates, anything really). The window is then blocked from being placed until the item is manually removed and the hearthlings have a path.
I was thinking maybe there could be a build priority where furnishings and decorations aren’t placed until the actual building is complete, even if you have all the requisite items ready. So the order would go: actual building -> doors and window frames -> furniture and decorations.