There is a second, more detailed walk-through illustrating how to convert a PB1-based plug-in, in this case the box object, located in a word file in <maxsdk>\help\Pb1 to Pb2 Conversion\pb1 go pb2 converson.docx. This directory also contains a "before" and "after" version of the cpp code that you can easily view in a diff tool to see the changes made.