Actually, I did have an idea for a yacht, which was a trimaran, much faster at a top speed of 23 knots at best speed, 42.5 meters, with crew space for six, can run on half that, and up to 9 guests/passengers. I guess Koko decided not to share that information though. 

Below is the main deck plan, an exterior shot, and one of the interior shots, and I can get more. It's a pretty forgiving design, stable on the water, long range, efficient.

[img=http://www.john-shuttleworth.com/port_bow.jpg]
[img=http://www.john-shuttleworth.com/adastra_mid_ga_web.jpg]
[img=http://www.john-shuttleworth.com/adastra_lower_ga_web.jpg]
[img=http://www.john-shuttleworth.com/adastra_helm_station_ga_web.jpg]
[img=http://www.john-shuttleworth.com/main_deck_interior.jpg] 

Splitting up into two groups might be a good idea.