Hello, and as I don't reside in the Land Down Under, I can't be of
assistance. From restorations I've known about I would say that a piano
of the vintage you mention (and often much younger), regardless of make,
is probably not worth restoring unless it has sentimental value. Player
pianos in particular never sounded that great even when new, are
mechanically complex, and most tuners don't like having to work around
the player mechanism. Old pianos often have cracked soundboards, loose
tuning pins, worn out hammer felt and other mechanical ailments that
make restoration a very costly proposition. A lot of vintage pianos
(grands as well as uprights) in homes are covered with doilies and used
solely as display tables. Sincerely,