As long as it's a good case, and a good case study, you're on a winner!

Christopher Nock

Yes, it's a common approach, but as they say, one man's proof is another man's reductio, and ethics is notorious for conflicting intuitions especially for cases that are considered to be underdescribed, uncommon, or far-fetched. Here's a relevant article: https://www.jstor.org/stable/20116427?seq=1#page_scan_tab_contents

Also, given your project, I should add that it is controversial that legal norms make a good test case for moral theories.