Detailing - Wood

Thinking through how to detail the exterior and interior wood, for appearance, drainage, expansion, durability, longevity, etc! Found this simple method of attachment with mitered corners, finish nails, and slight reveal in the Dogpatch neighborhood in SF:

We like the idea of a rainscreen, but it is more labor intensive, trickier, and might now be the best for taking out on the highway:

Perhaps more of a gap, attached onto furring strips:

Vertical and horizontal:

Fastening and profiles:

Some details from other saunas: