Thanks for bringing this back from the dead Gezzer!
Now, on a more serious note...
My first-born Bryan built a bridge out of cardboard for one of his engineering classes.
He had to span 3' at 3' high and the bridge was to be "tested to failure."
The assignment was "a bridge out of non-standard building materials."
You could have 2, he picked cardboard and construction adhesive.
He used 3ply cardboard and laminated 5 sheets together with the construction adhesive.
It was "surfboard" stiff, and the instructor STOPPED the destructive testing at 900lbs of rocks and two big students jumping on the rocks. Nearly 1500lbs of force with impacts!
They'd run out of rocks and room for students on it. The instructor was worried someone might get hurt if it failed.
Bryan's bridge was the ONLY one in history (12 years) that didn't break!
We had to use a chain saw to cut it up and put it in a dumpster.
So, if you really want to make a splitter out of cardboard, I know exactly how to do it...