all you need to drift at archerfield is a car, money and a helmet.
They don't scrutineer youre car unless its a comp and even then no ones ever looked over my car.
I bought a shitty open face helmet from a motorbike shop in slacks creek for $50 or so. They just need to meet the aus standards which will be on a sticker on the back.
Keep it sensible into turn 1 and have fun