It is indeed very cool. We looked at a timbrel vaulted roof for our new house, the engineer we spoke to had already completed this one and went on to do this one

One of the reasons the architect was keen on the vaulted ceiling was how much weight it would carry, ours was designed to carry 6ft of soil above.

We've ended up with a much more traditional (but still super insulated) construction, the roof will be planted over autumn.