Guillotine borne of insomnia

The title says it all. :-)

I keep seeing trebuchets and such posted, so I figured what the hey... I think that I might eek out a ballista one of these days (the next time insomnia takes over). I certainly do not pretend to be anywhere as good as the rest of you designers, so don't be too annoyed if this isn't 100 percent original in concept and CERTAINLY lacking in artistic flair. :-)

The only somewhat necessary things that it does not have are 4 rubber bands to cross on either side to