I think another big issues for ETNZ is the ACRM recommendation to allow rudder foils to extend outside the max beam.
The kiwis have invested a lot of time to design asymmetric rudder foils (one side wider than the other).

Their (official) argument is that extending them outside the max beam is dangerous for crew members should they fall into the drink, which makes sense.
Dont think a helmet (or anything!) will protect you from hitting that at 40kts.