I've never been inside one but from my understanding the J class seats in the KC30 are the same as the domestic business class on a 737. There's no freaking way I want our PM travelling for 14 hours. He's entitled to at least the equivalent of what Qantas now has in its domestic A330 fleet. That means a lie flat bed.
In addition to that a conference type area that can seat 4-5 people should also be a requirement. Maybe that can be converted to other uses if need be.
We live miles away from the rest of the world and so being able to work and rest well on the journey is a lay down miserere requirment. Heck, a shower probably isn't a bad idea either.