For making sandwiches on the job because I don't like spreading stuff with a sharp pointy knife or a box cutter.
I made the handle with a piece of L shaped aluminum profile crudely bent using clamps.
I then pierced a hole through the blade and the handle and test fitted it.
I didn't like how it looked when closed so I decided to drill a new hole after flipping the handle around. (Hence the hole at the end of the handle and the second hole on the blade).
I then riveted everything together twice (one smaller rivet inside a bigger one, no idea if thats a good idea or not but it looks better).
Cut the handle to shape with an angle grinder and softened the edges with a file then different grits of sandpaper.
I got the idea for the handle from the Higonokami.
If you don't know it look it up it's a pretty cool knife!