Another great LEGO find from TheBrothersBrick.
The builder uses a mix of round and regular parts to allow a slight offset position, resulting in the curved shape. The use of alternate round and regular bricks is a technique that has been used frequently in the past for curved ‘tower’ structures (eg. castles, windmills, lighthouses and even spaceships). But I believe this is the first droid I have seen built using this particular technique.