That looks like a solid, classic APA recipe all the way around. Simcoe-Amarillo-Centennial is a proven combo that works every time. I could quibble about things I'd do differently if I were brewing it myself (I've moved away from 30-minute additions, and I'd ferment in the mid-60's), but that's just personal taste.
As for dry hopping in a bucket, just drop them in. There's no trick to it, really.