Based on the photographs, it does not appear to be engineered - roof supports do not appear to be of adequate depth to support live, dead, and snow loads. People can dance on that roof and under most building standards deflection is the controlling factor for structures this size.
IMO, it is highly improbably that adequate structural analysis was done on all those small twisted members because branches and stunted trunks contain so many knots and so much sapwood.
On the positive side, the approach is straight out of Christopher Alexander's A Pattern Language, and any victims of the inadequate structural design will be due to Darwinian forces.
IMO, it is highly improbably that adequate structural analysis was done on all those small twisted members because branches and stunted trunks contain so many knots and so much sapwood.
On the positive side, the approach is straight out of Christopher Alexander's A Pattern Language, and any victims of the inadequate structural design will be due to Darwinian forces.
http://www.patternlanguage.com/leveltwo/ca.htm