I do not have the instructions, but the processes you are talking about are exactly the same as any polaroid back or pack film camera, so there have to be instructions out there that will be helpful.

Here is a manual for the pack film model 220. If you look at the second page, the open back is basically the same as your NPC polaroid back. The rollers are identical, etc.

http://www.cameramanuals.org/polaroi...laroid_220.pdf