Secondary bonnet restraint?
No, but keep something just in case the scrutineers at a particular event decide you need it. The CAMS Manual actually has a clear exemption for our cars in the regs
Fire extinguisher?
Yes
Helmet?
Yes
CAMS licence? What level?
Yes, Level 2S
Anything else?
Regulation stickers to indicate tow point and battery location. Sticker kits available from Revolution Racegear.
Club Membership card
How many runs at the hill do you get in a day?
I got 4 before it started raining @ Bathurst. could have got 5 if I went out in the rain. Depends on how many competitors turn up on the day and how long the course is.
What general cost is involved?
apart from your own maintenance costs for the car the Licence is $91, and entry fees vary. The Bathurst fee was $110. Accomodation if it's out of town
hope that helps