What do people thinking of this style of wall system. Some suppliers mention not having the need for as many trades so it reduces costs. It looks like you done need an exterior paneling, interior plaster, wall studs and wall insulation. How does these products stack up costs wise when you consider all the materials and trades above? Is it cost effecient? I'm am looking at raising a Queenslander house, having a garage on the lowest level, and building in using a sub floor. Would this system work for that?