Sorry I mixed up, the comment was from somebody else, thanks for the explanation, that bring a much more complete picture.
I do voluntary mentoring for a high school so I have access to a lot of Autodesk software, just installed computational fluid dynamics, Inventor and Mechanical Simulation and plan to learn a bit of that to analyse the design (Find the boat drag at different angles and quick verification of structure), I could then have a better idea of the weight.
It is funny that you showed me this video as I was looking at the vesta sailrocket. It is a very nice way to make the problematic heeling forces do good !
With a fixed mast, it would become more easilly "possible" :-)