AFT:  Presently there are two portside cabins aft, both of which share a common head / shower.  The starb’d aft cabin is the master / owner’s cabin, and has an en-suite head and shower. There is easy access from the galley above via the stairway and hallway, by making a U-turn toward the engine room, but first you enter the pantry / cool room that is separated and insulated from the noise of the engine room proper.

An alternate arrangement aft that I would greatly favor would mirror the starb’d aft cabin across the ship, removing the portside forward bunk room and providing the same en-suite head / shower to port.  In other words, both cabins essentially the same.  It would then be appropriate to designate the portside cabin as the ‘master’s cabin’ since its head compartment can be larger (to port there is no stairway to intrude).  With that arrangement, the on-center head / shower located aft of the engine room could be used by anyone onboard, i.e. day guests, etc.

In combination with Layout #2 as described above, this would provide comfortable accommodations for 10 people onboard, with three very nice cabins for the owners or partners (the two aft suites, and the large suite all the way forward), plus two very comfortable cabins with en-suite facilities for two additional couples as guests. — Michael Kasten, Yacht Designer