With document proofs based on a project, the only way to easily see the related Meta-Data of the project is to setup a document custom form that uses calculated custom fields to pull the data from the project level custom form. The challenge, is that in the document custom form every field is a custom calculated field with no display logic. Therefore, every single field is displayed. With calcuated custom field logic, we could tailor the experience to provide the data that is needed, without all the additional extraneous fields.
This enables a user in a Workfront Proof to click the details button and go right to the relevant metadata.