Thank you, Jeff; the photos you sent are definitely a start, and in conjunction with
Numrich Gun Parts Corporation, I am slowly able to start figuring out which parts I have and which parts I may potentially be missing...
Once Al furnishes additional information (photos, video and/or written tutorial) after early January 2014, I will begin the process of re-assembling my own Ithaca Crass and intend to document the process to aid others in the future.
Thanks to each of you for the assistance in this collaborative effort.