Hi Bill,
There'a a whole Aurora Knight Model culture online apparently. You are in good company on this question.
As far as the original feathers, well, there are "sealed" kits available online for $ X00's.
And, the built-up ones I could find photos of; the feather looks like something Liz Taylor would wear on her feet with a nighty.
You might consider doing whatever you think looks good. I'm sure it'll be great looking.
Bill