A couple of sites where you can download a book about Japanese
armor.
https://archive.org/details/MetJapaneseArmor
https://books.google.com/books?id=zV...0model&f=false
If are are fortunate enough to own a suit of Japanese armor, here is article on how to conserve it (look for the PDF file)
https://www.tandfonline.com/doi/full...eedAccess=true
Some interesting pictures from the 2015 LACMA show
https://unframed.lacma.org/2014/11/0...ler-collection
Samurai: Japanese Armor from the Ann and Gabriel Barbier-Mueller Collection | LACMA
There might be enough information here for the ambitious modeller to make a model armor out of paper or sheet metal.
-----------------------------------------------------------
A papercraft of an ancient armor that is for sale
https://japan-marche.com/category/se...74/language/en