What can you do during the troop break? Right - build helmets.
After resarching some pictures, i decided to build the "Cantina Sergeant". You can see him in several shots in the film, unfortunately never really exactly. HereĀ“s how i made it - hopefully the best:
"Cantina Sergeant" aka "Roadblock Captain" aka "Alley way Sergeant" aka "Docking Bay Sergeant":
And here some Reference pics: