I see a new frame being lifted into place without these “clamps” having been removed and replaced by treenails in the frame immediately behind it! And I do not see this double nut you speak of while endlessly apologizing for this bunch of halfwits. Next you will tell us this is just a pretend photo they took just to illustrate their website and not real construction.
Personally, I do not even believe the wood they are building this ship out of has been seasoned for even a weekend before it is going into the hull.