Tim Puro writes:

 

I attended that same Don Williams course.  Here are pictures of the bird's mouth jig. The table is about 5" wide and about 11" long.  You cut the veneer by moving the veneer saw up and down perpendicular to the table of the bird's mouth and you move the veneer into the blade.  Think of it as a manual version of the Delta scrollsaw.

 

Tim Puro
Monroe Furniture Restoration

Bloomington, Indiana