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http://selector.com/nz/products/afs-logicwall-system Im not sure Id go as far as tilt slab or precast for a sleepout myself but I worked a few weeks conduiting out these AFS walls, the whole system...

Price up spending more on interior linings vs just doing poured block walls with a render on the outside and just furring and normal gib inside for if you ever want to go E-cat.