Amazing is right.
It looks like an outward trek to get from one wheel to the other.
The crew are down below.
Back in his day Agnelli(Fiat) used to fly into Antibes in his helicopter. Get taken out to his yacht Stealth by rib that was already under sail. Helm for an hour then rush back to work.
That was straight from the office sailing. Lots of crew involved though.
Was this the initial idea that created Wally!
With the size of that rig I would have one crew member solely dedicated to making sure those running backstays were properly set.
Great video, thanks for sharing.
You can see a couple of people emerge from down below at 1:10 into the video.