Heavy lift balloons are pretty cool, but seems to answer a question that no one is asking anymore and speed is an issue. The "Flying Bum" unfortunate popular moniker...probably has the marketing folks cringing.
How about this non-starter project called the Halo:
http://www.telegraph.co.uk/luxury/travel/89253/halo-the-330-million-airship-of-the-future.html
Now that is ridiculous notice they didn't predict airspeed. If the Airlander only does 90kts and the Hindenburg had a cruise speed of about 125 kts , as large as this thing is, I can't imagine it would approach that speed. Wouldn't it be faster just to pilot the yacht to where you want to go? Imagine trying to fly into a headwind in that thing.