You're correct - DF does not have a right side cabin door - jettisonable window only on the right. Don't think that makes it unique though - pretty sure i've seen that configuration on other S76 - The machines with "cocoons" have only one door don't they?
To be completely correct - it does have a RH cabin door, except it's filled, sealed and painted over so that it appears not to be there. Not sure when this took place - may have left the factory that way or been done when it was in Japan.
OH