Never built a throwing knife before, but I have a friend who wanted something kind of different so I gave it a go. The total length is about one foot and it is about 3/16 inch thick. I used mild steel, but color case hardened it using the bone and charcoal process, the handles are leather held in place by 8-32 screws so they can be easily replaced in the future. Though casehardening wouldn't be a good heat treatment for a regular knife, for a throwing knife it seems to work out fairly well.