Update (With a bunch of pictures!):
I'm happy to announce iv'e finished the first coat of bondo and painted it in a primer/filler!
I still have some work to do on the back half of the helmet, namely fixing up the brow and smoothing out the areas around the ears. This being said I have decided to take this project in a different direction than initially intended. Originally my plan (after assembling the pep parts) was to fiberglass and paint the helmet then make a silicone mold that i could use to cast a resin helmet in.
I have decided not go in this direction.
Since the start of this build I have been referencing the 501st and the whitearmor.net on what materials and paint to use. During this i learned it would make more sense (both in terms of authenticity to the films and cost of materials) to make the finished helmet out of white abs. This means i will be using the helmet for vacuum forming rather than resin casting.
Before i can do this though i'll have to rework the face mask.
I assembled the front mask and visor without thought to adding fiberglass to the visors interior or how i might apply bondo to the visors inner edge. This means i will have to re-pep the face mask and visor as two separate pieces then add bondo and fiberglass.
TLDR: I will have to remake the front face mask since i goofed it up. But once the face mask is finished i will start working on vacuum forming the helmet (whose build will be on a separate thread)