and keep in mind, I have done implementations as part of an AD switch over and those with AD already in place, is to keep the AD design separate. Active Directory is the backbone of the Network\Company design and organizational structure. Whatever tool you implement, Altiris for example, needs to be molded to fit those organanizational structures.
The hierarchy and design document, I think provided to you eariler, gives some examples of how to place Altiris based on the type of organization, but it's not exhaustive, nor should it be.
One of the main feature of NS 7.x is the abiltiy to create filters that can be used repeatedly against many groups to acheive the desired results. So, you can import your organziational structure as is, and then have pilot, production, etc targets as desired.