Frank, You just inspired me big time. I'm like you, I don't have a knife that I have made but I have been wanting to make a special one for myself for a long time.
It just so happens that my father was a body man(collision repair technician as they are called these days) and I have several of his old files hanging on my pegboard. They are just like that one. They were used to file body putty and maybe even lead. I can remember him spreading molten lead onto car panels and smoothing it before bondo came to the market.
Anyway, what a fitting tribute to my father it would be to make a knife(and keep it)out of one of his old files!! Not only would I be using one of his tools, but I know I use the talent I inhereted from him in everything I make.
Hope you don't mind a copycat.
Oh yea, that knife is AWESOME!!! Mike