Assembly was fairly easy but not anatomically correct. The ribs don't connect in the right place on the vertebra and the right collarbone on what I got was screwed in incorrectly (which can't be fixed). The screws do not allow for close articulation (connection), which can make it difficult to actually envision the function unless you use your imagination. My recommendation: If you know what the anatomy should look like, this may be enough. If not, just pay a little more and get something better.