I'd love to give you a ready-made, one-size-fits-all questionnaire. The fact is, there really is no such thing.
You are well on the way of developing a comprehensive approach to gathering requirements. I encourage you to not overlook the technology architecture, infrastructure and operational procedures. These aspects all have requirements that need to be flushed out. I also firmly believe that understanding the business process model as well as enterprise data model is critical to fully understanding the functional requirements of your data warehouse. Understanding the process model drives to understanding the corporate & functional goals, key performance metrics and business information needs. These drive towards understanding what your information access layer needs to support.
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