This is a work in progress of a Pit Droid head.
I can't find head dimensions for it anywhere, so if you happen to know what the 1:1 dimensions are for the dome, please comment and let me know so I can continue to design the rest of this droid.

I designed it based on the DUM-series Pit Droid, WAC-47 from Star Wars: The Clone Wars season 5, episodes 10-13.