If they are used to Provide the Works they I don't see why they can't be a valid Defined Cost where the documentation is specific to the project, that is Main Option C, rather than the entire suite of documents.
Although the Contractor should have a level of understanding of NEC contracts, even an experienced and knowledgeable NEC practitioner needs to refer to contract documentation from time to time.
Although the Contractor should have a level of understanding of NEC contracts, even an experienced and knowledgeable NEC practitioner needs to refer to contract documentation from time to time.