I've looked for details on this helmet forever but no one seems to know anything about it. I've always thought that perhaps it srated out as an early Vader dome.
I'm working on this helemt as well, I have decided to scratchbuild the "comm box" on the side, but can't find any good reference pics. It does look very similar to the greeblies found on the rebel endor commando & rebel hoth trooper outfits