I love this unit! Now your students should be quite comfortable with the idea of chord building, half steps, and basic Roman analysis.
I always tell my students that this unit is where music starts to get really fun, because it starts unlocking more potential to be creative and have choices when writing music.
I go into the process of what inversions are, why they exist, how they transfer to Roman analysis (and where that comes from), and how to figure out inversions. Lots of examples included!