- Suspended chords - sus2 and sus4 chords - Inversions of chords by 4ths or 5ths - Suspended chords in a cadence - Harmonic ambience Have fun! :)
I would explain it in a different way, starting from triads rather than chords by 4ths and 5ths, but you put a lot of work in it anyway;)
Is it me or does anybody else think music theory and the explanations behind it are beyond necessity? It's almost like a rule book as complicated as the IRS tax laws, which we try to follow in small amounts, but end up breaking with creative accounting. The more I watch and read, the more confusing it becomes.