If you like things like this, you might also like The "Making of Star Wars" books by J.W. Rinzler [0]. They provide a view of how the story was made, the people who made it, and many interesting facts.

[0] https://www.amazon.com/Making-Star-Wars-Definitive-Original/...

> Junk article that does not cite any real reference between Masamune's helmet and Darth Vader's design.

Agreed. There are similarities, but nothing to directly tie them together.

If you get The Making of Star Wars[1] book there's tons of detail on the development of the characters, including Darth Vader.

I think this connection is largely coincidental.

[1] https://www.amazon.com/Making-Star-Wars-Definitive-Original/...