In response to a couple of questions: I don't have any step-by-step photos of this resto. I honestly never imagined it would turn out this well so photos weren't on my mind. I am working on another helmet and will try to document things a little better. Though, on this helmet, the major part of the work was cleaning. It was absolutely filthy. Filling the extra holes (I still don't know what the purpose of them was, perhaps a larger wappen) was the other time consuming task. I'm still learning about the best way to do it.
Otherwise it really was searching for parts. I purchased the chin scales and rosettes early on and then had to wait until the wappen and spike were located. I was going to use a "normal" sized spike but got lucky and found an extra-tall version. As you can see I polished everything. I know a lot of people prefer to leave everything alone. However, since most of the parts for this helmet came from different sources, everything had a different patina. For example the rosettes were almost black, the spike base was polished (with a lot of residue remaining) and the spike top was very dark brown. The chin scales also had leftover polish between them. Now everything can "age" together.
As far as the chin scales question: They are flat. My photography skills aren't the greatest and I think the angle of some of the photos gives the impression of a slight curvature. Thanks for everyone's interest. I appreciate it.
Regards to all,
Richard