Make size of active models available in Administration

For situations where a user may wish to move models around for sizing reasons, it would be really helpful to see the size of all active models in the administration space. This would help anyone looking to rearrange models to ensure they can fit a model they'd like to move into the new workspace, or so they may find a workspace with the right amount of space for said model. This would be much easier than reviewing each workspace individually to determine size.