Hey awesome web community,
1.) Here are the Common Core resources I mentioned that our group developed/collected during our time at PCMI: Rubric and Supplemental Doc. Even if you work outside of the country or in a private school, I think these docs would be helpful, because you would probably still want to implement similar mathematical habits of mind.
2.) If you do use it to evaluate your own task/teaching, can you please give us specific feedback on how to improve it? :)