That was a very interesting video, hadn't seen it before, and thanks for sharing.
With regard to rudders, we see again they're more than just something hung on the end (stern) of a boat. So often we hear about boats that have a rudder failure and this one, it turns out, was no different. Fortunately they had a replacement part (leather strap), but unfortunately, it looked a lot like the strap that failed. Thankfully the shakedown cruise ended successfully and they'll probably have a few design changes for the return trip, like those wood gadgets (pre turnbuckles) used to tighten the stays.
Sure wasn't a party boat ... the crew endured a lot.