Do you mean the parts of Kerfur-O or Kerfur-O itself?
For the parts, you need the recipe book to craft them. Check the kerfur document binder for the recipes if you still can't craft them to see if you are missing something.
For the Kerfur, you need the head, chest, pelvis, 2 arms, and 2 legs. You do not need the recipe book to assemble it.