Lots of little progress is big progress right?!
I managed to build up the top of the helmet seam with regular bondo. It's not perfect, but it's a lot better.
I also resined the backs of the thin buckles and spot putty'd the front.
I wanted to make the range finder magnetic, but I didn't want a bare magnet showing on the helmet when I didn't have it attached.
So I cut out a piece of metal and used epoxy to stick it in (both sides for symmetry). Then I used epoxy to affix 3 magnets to the range finder and epoxy putty to fill out the circle so it remained flat.