Hooray, it's done! The congratulatory purl scarf for my sister is done!
I used Malabrigo Worsted, madelinetosh merino light and Rowan kidsilk haze, and I love the way they look together. I stopped measuring it, though I suspect it's not quite as long as the pattern calls for - but it's still taller than me, and definitely long enough to loop comfortably around her neck.
The photos don't really do the pretty yarns in this scarf justice. Not the most thrilling project to knit, but I could definitely see making one for myself in the future - perhaps with bigger needles and casting on a few more stitches, since this one is a lot skinnier than I pictured. So, yay scarf! Yay for managing to finish projects despite working round the clock!