It depends on the state you live in,some are strict on it and some will pass it if you put in the extra bracing required based on the original ron champion design without testing.i will try to find my wa based manual and send you a copy of the page with the extra bracing required(not home til next fri 23rd)also if you build from 2mm wall this gives a 25% increase in weight but a 30% increase in torsional rigidity alone.
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