Obviously I can see the potential flaws, but the builder , and his team, have a track record of very competent heavy engineering and his approach, thus far, looks to have the right degree of caution.
The eye-catcher, for me, was the revelation of the S52 'loop' - which looked to be complete and included the inverted portion. I would have seen that as impossible (or extraordinarily foolhardy) in an articulated rotor design !