Here is a source for a printable reproduction manual that is almost as nice as an original manual :
Pentax Manuals
In Windows 7, set landscape paper orientation, and select the "Booklet" printing mode (one of 4 major printing modes in the middle of the dialogue page), and print it on a color laser printer. Then you can cut out the pages on a cutter cutter, gently bend one side of the manual in half (tear drop bend) and then add 2 stapes in the middle, Done!
I bet most people would have a hard time telling the difference between your manual and an original! The only downside is a slight discoloring of the cover page vs. a NOS manual that would be completely white.