Finally got visual of both the adult female and mature juvenile. The first photo is of the adult female. Second photo is of the mature juvenile. Can confirm a successful breeding event on Red Hill, connected to sighting http://canberra.naturemapr.org/Community/Sighting/3361641
The larger adult male appears to reside on Mt Mugga Mugga/Isaacs Ridge, with occasional visits to the adult female on Red Hill.
Interesting observations RoyMcD! This species seemed to be largely absent from the smaller and inner units of CNP (except Mulligans Flat and Rob Roy) but may be returning, like the Wallaroo has done over the last 30 years (and is continuing to do).