I'm working on this now. This is a good pattern. I got the idea from Zooty Owl's granny c2c cowl pattern; click here for the pattern. I did modify it slightly; Zooty Owl didn't work a ch 1 in between each of the 3 dc clusters, but I did. So far, I like this pattern and it should prove to make a great afghan!
EDIT: I noticed that Clare at Bobwilson123 also has a video on this same pattern! Here's the video: