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SAIC released its DE Profile publicly; it includes some useful customizations and a suite of validation rules that enforce model quality and consistency.
The profile was used by teams of students at the University of Detroit Mercy to built system models based upon the Mars Society's University Rover Challenge. These models, built by 5-6 students in seven weeks, are examples of the modeling approach and the improvements in quality possible. Note that many of these are approximately 20,000 element models...so they are reasonably large for something built so quickly by part-time modelers.
http://hypermodeling.showmethewow.com/