I'm from West Texas where we have no trees. But I can get all the scrap lumber I want. Will lumber work? Will it decompose too quick? Does it have unwanted chemicals? How does one decide how much wood to use or how tall to make it? Will it make any difference whether you dig a hole or if you just stack it on the surface of the ground? Any good books on this subject. I don't like computers, need something i can read and hold in my hands. Thanks.