Just one thing to remember and that is that there is a maximum weight for each individual type of ejection seat, and this is normally defined as a "nude" weight, not boarding weight (nude weight plus flying equipment, clothing etc). From what you have said I doubt that this is the problem here, but forewarned is forearmed in case they try to throw this one at your friend. It might be worth trying to find out what the upper weight limit is for the ejection seats in the RAAF aircraft. Good luck!