Model size is not always a good modifier for the metrics threshold values.
At our office we usually deal with different model types: main models (contains rooms and all typical building elements, may be split into multiple models depending on size of project), auxiliary models (usually facades, roof structures etc.), site models, detail models (containing most of the detail views hence a lot of detail components, line work and annotation). All of these have typical characteristics which also means they produce very different metrics, e.g. a detail model containing even a single room should set off alarm bells whereas the