I am considering using straw/clay infilled timberframe in a passive solar home in SW Montana, a very cold, dry climate. Can I effectively use a wrap/strapped exterior system like Jack Sabon illustrates in "Build a Classic Timber Framed House" with a simple stud wall infilled with straw/clay? Would it be better to have the whole wall be breathable? Say using 2.5" rough cut siding and no insulation exterior to the frame or using breatheable rigid insulation like rigid fiberglass? Anone familiar to this or recommendations?