1. Not sure I understand the scalpel idea. How is that different to the knife - the knife only doesn't cut through bone, so how would the scalpel be deeper?
2. Actually a saw that you needed to move back and forth was also an idea I had. But I was thinking it would cut all the way through like the chainsaw.
I can't really picture how it would look and work if it didn't cut all the way through. Maybe you could clarify?