I'm not actually in the garrison yet and inlay not be for a few months but over everything else it's the cauldron that has drawn me to being a TD. I would love to be as accurate to what is seen on screen as possible but if it's not representing rank then I don't think it matters.
Also, looking through the pictures of the TDs on the 501st page I have seen different emblems on people's pauldrons. Is this allowed or did they just do this for when they aren't officially trooping?