[whpalmer4]

Yeah, sounds like a good way to put it. Discussion of decisions made, analysis, etc. probably wouldn't find a good home in the project plan itself, but are still likely to be valuable reference materials. OmniPlan will allow you to link a document to the project plan document, and you could also link the OO and OP documents to the OmniFocus project. I would recommend linking rather than embedding, especially for documents that may need to change, like updating completion status for the OmniPlan doc.