Here's a couple of diagrams showing the dangers of the little ledge in the fromt cut or scarf...this can be created if you don't pay close attention to getting the two cuts to meet accurately.
Here's one of the problems with sloping cuts
and finally the danger of cutting into the hingewood itself....really bad idea!!!
I'll pm Eric and ask about the pdf problems, there's a really great NZ felling manual that has great diagrams and very sound directions.