Edo kacchu appears in the tradition of armour displayed for the May seasonal festival. Its craft specification treats the helmet bowl and the laced components as separate making questions.
Technique and structure
Tokyo lists several alternatives for forming the helmet bowl, including hammering out, joining and mould-based methods. A separate requirement describes making the kozane elements used for odoshi-ita. Lacing is then specified as hand work using kebiki-odoshi or sugake-odoshi. Those clauses should not be collapsed into one technique: knowing a lacing name does not tell a reader which bowl-forming option was used.
Ask for a component description
The material list includes metals, washi, leather and cords. It is a range of craft materials, not evidence that every visible part is metal or that every example uses the same combination.
For international readers
Confirm the actual components and intended display use with the maker. The reference establishes no protective-equipment rating or suitability for combat.
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日本語
江戸甲冑：鉢づくりと手作業の威しを分ける
江戸甲冑の技法規定は、たたき出し・はぎ合わせ・型抜きなどによる鉢づくりと、威板に用いる小札づくり、毛引き威しまたは素懸威しによる手作業の威しを分けています。威しの名称から鉢の製法を推測せず、各部の素材と飾り物としての用途を確認します。防護性能を認定する解説ではありません。