Jesus there's a shitload of lazy fucks on this thread.
Anyways, for those of you who wanted to copy Heath's design but aren't too confident in your carpentry skills (like me), you could build one of these, which is very similar in concept but has some obvious differences.
For someone as "unhandy" as me, it was pretty simple to construct - just buy a saw to cut a shitload of PVC, buy some wyes, and glue them together.
I used 4" PVC, but the original design used 3" and that can be made for ~$500 (mine was significantly more expensive because the price for fittings rises exponentially when you move up in diameter).
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EDIT: BTW, whatever PVC method you choose to use, I'd HIGHLY recommend using 22.5s instead of 45s for a much more rounded structure - instead of being an octagon with one side missing (7 sided, obviously), I was able to make mine 15 sided (16-1 = a pentadecagon) and only lose 6% of my plants for access, as opposed to losing 12.5% if I was using 45s.
More sides also means more even distribution of light to the plants............just my little contribution to the thread.