THEORY

The new 'F#m' shape over the GM7 introduces the b5 note (C#) which, used tastefully, gives flavour to the chord.

The Ab7 is a straightforward arpeggio.

As we played C harmonic minor over the Am7b5/D7b9, so we can play the F harmonic minor over the Dm7b5/G7b9. It's the same idea, different chords.

The CM7 is treated the same as the GM7 only higher up :)