I've been working on this over the weekend and I am fairly pleased with the result so far.
It was constructed using ForgedReclaimer of the 405th's very high detail model available here: ForgedReclaimer's Pepakura Database
He not only included the helmet but all of the attachments available and reference images and detailing guides.
My camera does not do justice to all the small details.
With Up-Armored attachment:
The attachment is held in place with a bit of masking tape so it looks awkward but that will be solved before the piece is finished. Also the image from the front is at an odd angle so it looks larger than it actually is.
Hardened with Rondo(Fiberglass resin and Bondo slurry).
This will be on the back burner to my Blood Dragon build but I cannot wait to work on it.
I also have a small Rondo Tutorial I would like to post but I'm not entirely sure where to do so.