As far as I can tell, the Larsen-Truss is simply a form of double-wall framing that uses plywood gussets to space the walls - 2x4 for the load bearing walls and 2x3 for the outer frame. The wall system used in the Maine house example (initial post in the thread) does not carry any loads and is all 2x3 - merely vertical members to hold the insulation, sheathing, windows, doors, and siding. Would the plywood sheathing (and, to some extent, the drywall) offer any shear resistance?
