Uh, he has shelter from wind and rain. There's a waterproof hatch into the interior. Did I misunderstand you?

Yeah, I'd had a few whiskeys when I read the article and I missed that. My mistake. Still a rough trip, and I hope he makes it. That takes some serious balls.

Somebody has to be outside the hatch in a storm, to try to keep the boat from tipping over.

"With a balance point about 16in above the keel and a 5ft draught he has a stability profile most designers would kill for."

That boat's not tipping over.

until big jumps between waves deform the light hull and the seals start leaking

Its a non-moored mooring buoy... if anything can survive, that design will.

But, a multiday storm in that pan, will be anything but fun.

With so much weight on the keel, the boat is very unlikely to tip over. And if it does, it will right itself. It's most likely a very rough roller coaster ride, but unless you loose the keel or water gets into the boat you'll come out upright. Since the space inside is so limited, the usual danger of bruising yourself when the boat tips is limited. Not much space for objects to fly either.

This video shows how hard it is to capsize a properly ballasted sailboat: https://www.youtube.com/watch?v=R7mYTOnOs3Y&t=3m45s

Sweet video. Now I want one...

When there is nothing you can do then you do nothing. There is no requirement to be outside.

Still doesn't sound like fun.

People who do extremely uncomfortable things to break records are not in it to have "fun."