I'll try and make it to the hillclimb to have a look. Don't think I'll participate, after my little incident at the skidpan lol. Do spectators still need to park up on the dirt carpark, on the left side of the track, as the other section was for competitors only last time.
If you need to check the gtrs braking, there is a dead end road in symonston and, theres another dead end road off the long stay caravan park in Narrabundah I think. May be able to use those for a quick test.