It is now canon that rex's elbows bend the wrong way! Whoa!!!!!
When I was putting my custom commando together, i got really confused about the elbow armor in particular. Did the flap point up, or down? With the armor Im using, imo the flap looked and functioned best with the flap pointing up, because with the arm bent the elbow would actually be completely protected. And it meshed perfectly with the bicep piece too.
But this source pic said, down.
And that source pic said, up!!!
No! Down! No...!!! Over there the flaps point up....
It was like Sleeping Beauty's dress flashing from blue to pink at the end of the movie.
At the end, about 75% of my sources said point them down so thats what I did. Unhappily. But I could see where ppl get confused.
No excuse for the bicep pieces though.