Yup, there are the "purists" in any endevor.
When it comes to BP rifles I have, in some respects, kind of evolved into one myself.
Back when I was planning this rifle I selected a general style but picked the parts based on what looked good to me; and had a good time doing it!
Now, a few decades later, I am more apt to pick an actual style and stay within the confines of that school. i.e. no Hawkin designed parts on a Po Boy So. Mtn. Rifle!
Or, as is the case with a little .32 cal. flintlock I've been working on for the last 15 - 16 years
, I may take measurements and pictures of an existing rifle that strikes my fancy and try to make something like it.
Heck! I always figgered you can do whatever you want as long as it don't hurt noone else none!
Like the perfect BP huinting rifle I designed whilst sittin in a tree for 10 - 12 hours one day. Basically it would have a 28 inch .54 cal fast twist barrel for shooting conicals, a Hawkin style hooked breach, lock and tang, a peep sight, Leman Style half stock with a shotgun butt and all browned iron accouterments.
Now you got to realize this was before all these in-line, sabot shootin BP rifles got popular, but I still don't think my design would change any...
It still sounds perfect for me!