Hooked carving knife

I tried to carve a spoon a few weeks ago.  It went well until I tried to carve the scoop.  I could really have used a curved blade.  Instead, I gouged it and ground it smooth with rocks.  It worked, but I'd rather have carved it instead.
Back at school, I was reminded of the "crooked carving knives" I saw on this site.  I love it when people provide lots of details on how they make things, even when they're trying to sell them, because it makes it a whole lot easier for me to try to make them.  So I tried making one.