I have that book. I already made Sunny (I think that's the name :??); I think it's pattern number 14? (The yellow one with the tray sitting on it.) Anyhoo ... just make sure to wrap BOTH strands around the needle and you'll be fine. I made few mistakes and only wrapped one strand. It's was difficult to fix, but time consuming.
And I agree that as long as your guage matches, you could definitely use one strand of chuncky
I put design #9 on the needles several months ago ... the pattern itself is easy enough ... but it REALLY TASKS THE CONCENTRATION!!! :rofling: One of these days, I'll finish #9! :doh: