Have been dancing around this idea for decades and am back here again to solve the problem of accessing the central hull from the bridge deck, without traversing the low ceiling salon. Moving the salon to leeward allows a single, very conventional hatch with direct access below - three steps, 24". Sketches are unrefined explorations of accomodation space.
These sketches of a 70' Pacific proa were done in the process of learning Rhino CAD. Nothing is final. The basic parameters of the vessel were defined decades ago, the "saftey ama" to leeward is new, and there is still a lot of room for style (like cars!).
This safety ama is one foot off the water at rest, provides 4,300 displacement at 10 degrees heel and gets max. displacement (12,500 lbs.) at 15 degrees heel angle.