"...and yes it has been done on a sailboard."
Geez!.
So, someone puts a gun to your head and says 'Climb Everest or try this crossing on a sail board'. Which do you do...which do you do...?
I am too old to climb Everest and always fell off of sail boards. The one that it was done on was about 20 feet long and had a small hatch were the guy could go down and sleep when he wanted to rest. He also had an escort that stayed with him all the time. The trip is actually very easy. There is plenty of rain water and fish. The trip has also been done twice in rubber rafts, once on purpose and once by a guy who abandoned his sail boat. However the sailboat didn't sink and beat him to the other side by about a week.