Here is a marking knife I finished making last night. The handle is from a walnut log my FIL gave me, the blade was an old recip saw blade, and the ferrule is a brass compression fitting.
Let me know what you think! I do have one question for anyone that has made something like this. How do you fit the tang to the handle? I used a drill bit that was about the same diameter as the thickness of the blade and drilled several holes, then working the bit back and forth joined the holes. This left me with a loose fit and I used quite a bit of CA glue to attach the blade.