A 200 member project team is working on a large and complex system with multiple...

Scrum is not suited for such a large project. The team should clearly use the Waterfall method or the Crystal Clear method.

Ask all potential members of the project team to have a meeting first and decide if they agree to use Scrum.

Agree a logical sub-division of the system so that smaller Scrum teams can work on sub-systems and can add tangible value.