It wasn't hard at all. It's a 6 stitch repeat for each odd row, and the evens are purls. Even the odd rows are technically repeats of another one but the difference is only that the row starts in a different place. Still, I did find lifelines to be invaluable. I would equate the silk called for with about a worsted weight. You could use the sport weight and make it larger. I would use a smaller needle, though. It depends how 'airy' you want it. It could easily go either way. It's more of a warm wrap than a shawl.
Mine measures about 22 inches by 70 inches unblocked.
It's done, and it really didn't take me very long, so any more questions, let me know!