Here's my version of a Phase One Commander Cody helmet from the Star wars the clone wars tv series. I'd scale it up around 190% to fit a persons head. The sunvisor should just slide right over the dome and the scope parts fits in the slight groove that's cut out on the right side of it and the antenna just fits on the ear and should be able to rotate around the peg.

Be sure to post a make and check out my other models.