And it's a free download on Ravelry...
I think that the throw would look amazing knit in Rowan's Hemp Tweed.
Building Blocks - I'm using tosh merino light on 3.5mm needles. I normally would knit a shawl in merino light on a larger needle but Stephen suggested going with a slightly smaller needle for a tighter knit.
The pattern is very well written. If there is something Stephen thinks you might be tripped up on, he makes a video for you to watch.