Ive driven round the mountain (it's public road) a couple of times, it's about an hour and a half from my father in laws place. (About 300 kms west of Sydney, over the blue mountains, which are gorgeous.
Definitely a pilgrimage to do. They ran a 24 hour race there a couple of times in the recent past as well, about a fortnight before or after the 1000.
However I have been warned that the racegoers are 'bloody animals' but I've camped in HA, they can't be all that bad.
I think we're planning a family holiday the year after next, and I intend to take in the 1000 or if the timing is out, one of the eastern creek rounds.