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I agree. From the captions on the construction pictures:

> Lift logs, prop up, nail together and continue until no longer wobbly.

That's not very reassuring.

On the other hand, while structural soundness was much worse in the past than it might be today, this method has served humanity fairly well for a very long time.

The soil is heavy, much more heavy when it rains. It's an accident waiting to happen. I used to have a construction company in Norway where these grass roofs are popular, worked on several of them.

It would be good to know if they got a structural engineer look it over. Because it really doesn't look like a stable structure at all.

When building a house into the side of a hill, I one should consider the durability of the hill as well as the house.

Even if it doesn't collapse under its own weight, it's not much of a hobbit house if you can't walk (or jump) on it.

[Bad things](http://green.blogs.nytimes.com/2011/02/18/green-roof-collaps...) [can happen](http://en.wikipedia.org/wiki/Zolitūde_shopping_centre_roof_c...) when green roofs aren't properly constructed.