A sample of Stuc-o-Flex "Waterway" rainscreen drainage mat arrived in the mail yesterday. It is the material I hope to use between the triangular plywood roof sheathing and the smoothing mache layer.
I mixed up a small batch of mache and applied it to the top of the mat. The mache will take a few days to dry but after working with "Waterway" a bit I think it will work quite well. I love this mixture of very high tech and very simple technology.