This is astonishing!
Looks really like quite interesting bluewater boats! And they are indeed very light.
I wonder if they are really fast in real life. Which speed can be expected? As discussed before the payload could be the cruicial point. However, even if not really fast, you would still have a nicely optimized design for a circumnavigation! May be better than an RM.
And, of course, I like the two tillers which leave more living space when mooring.