Here's what I've got... This is my primary reference, for clarity and detail and resolution:
View attachment 1656960
I've got some other 4K screengrabs from the film to supplement this and a few publicity photos, but this one does a good job. I can make out the "goggle" undercut, the main helmet rubber brow band, and then the two layers of the bottom edge of the add-on piece -- the inner arc with the insets above the helmet lenses, and its own rubber brow band.
From that, I've gotten this, starting from one of the old Hasbro toy Boba Fell helmet front halves, with the bottom edge extended:
View attachment 1656961
I have some more recent pics, but this does the best job of showing what I used as the basis. I scratch-built the oval mounts and the targeting sensor mount for the bottom edge. The marks on the scrap sintra are where the rubber trim needs to get cut at before attaching. But I had no reference from the film or publicity material for the
back edge of the thing. Beyond the ovals, I didn't know how this thing might be mounted, how closely, what spacers there might be, etc. So the Anovos prototypes were helpful in that respect:
View attachment 1656965
So that's what I'm working on right now.