Silent hill 2 great knife

[Lhet]

I already posted this on another forum, but i want to get all the information possible. I want to make Pyramid head's great knife from Silent hill 2. http://www.silenthillheaven.com/Site/SH2/Weapons.html Go down a bit to see a picture of the great knife. It is about 5 feet long, and is incredibly heavy. It is something you have to drag around. I am thinking steel or iron for the blade.