Skygunbro made this helmet a few years back. I don't think he posts here but you can check over on ct.net.
Depends on which helmet you are talking about. Skygunbro did the version with the two "tube vents" in the front. Marrow Sun did the other style which I have one of only two prototypes (that I am aware of) that he did. I know he was working on "updating his as well, but I have not been able to get in touch with him to get a new one. I've been wanting to upgrade mine for some time. I have the White Fett based on the paintings McQuarrie did for ESB that show Fett and Vader on Cloud City in the dining room and in the jail cell area.
Very nice Geo! Is the ESB concept Boba where the idea came for Capt. Rex?