Woah lol. I'm not sure if that
should be sheet mulching on steroids or
hugelkultur on crack. I'd say the advantage is that it breaks down into soil very quickly, which could also be a disadvantage vs
hugelkultur. I don't think there's much advantage vs regular sheet mulching, since you generally use sheet mulching to cover larger areas anyway, you don't really want it 3 feet high, or at least it isn't very practical.