In trying at all costs to avoid an outboard frame enclosing my timber frame, I've been thinking about the following system (which I'm sure is nothing new but a search didn't bring up any posts specifically addressing this idea).

From outside to inside:

* board and batten siding
* 1x horizontal nailers
* sheathing directly on timber frame and studs (some timber studs and and some 2x studs)
* wall cavities between timbers and studs receive blown in or damp spray cellulose (to 6" or so)
* lath
* lime plaster flush with interior face of timber frame

I can see some issues perhaps arising with timber shrinkage affecting the interface between timber and exterior sheathing, as well as interface between timber and lime plaster. Any other issues that should be obvious to me but aren't at the moment that should really concern me? Thanks,

Miles