Hey Slap...almost didn't recognise you without the Penguins....
I did a 'design your own boat' thing on the Jeanneau website and you can order a screen that divides the head compartment in two but its not a completely separate shower stall as in the three cabin.
Me I'd be perfectly happy with the three cabin head, port guest cabin same size as in three cabin and extend the galley into what is the starboard aft cabin.
Still and all, as Paulo says, its all about cost. You and me can just have the WLYDO and the Maestro design one for us from the ground up. I wish.