I've been searching everywhere on various forums as well as the maze that they call the CASA website to try and find the ruling on home built 2-seat helicopter registration, and the consequent implications so far as it's maintenance and use.
I'm familiar with the RAAus regulations with regard to their experimental category (95-10 I think it's called) as well as their category which my J160, 2-place, 51%-built falls into. Consequently, I have ruled out RAAus registration entirely because of the fact that they exclude powered rotorcraft, except gyro-copters. (Please someone tell me I'm wrong!