We have a fabulous book called "one magic square" that gives some awesome info (some of which has been mentioned in this thread). Thoroughly recommend it. You can google it for details.
We just built our raised garden bed from sleepers, metal brackets and timber screws. Cost about $200, and took about two hours for a 3.5*1.5m box at 60cm high. Haven't filled it with soil yet, but we plan on following a lot of the ideas put forward through that book. We can't do it yet as we're building the house, so the box is at the building site!! When we move in we will probably erect a second box and go from there. I can't wait!!!
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