I feel like you have asked these questions before in several different ways.
That being said, there are several different ways that one can go about what you are asking. I can only tell you based off of working on a large NFL American Football renovation that was all done in Revit, now over 10 years ago.
- Not sure what you mean by 'different areas' - if it is one large building then each discipline should have a model for that building. If it is several different buildings across an area, then I would recommend that each building is a separate model.
In the past I have usually picked the architectural model to be the one that all other models are linked into. One, the architect is usually responsible for the 'form and function' of the building, and where one would usually see a master list of drawings. The other disciplines should also be linking in the other models for coordination and collaboration.
You also could have a Master Site model that has everything linked in. The only purpose of this would be for a master list of drawings (if you needed such a thing). I did this on a project where we had 20+ different models getting linked together. No modeling was done in this master file.
As for location of components, again I don't understand this. Everyone should be linking in the architectural, structural and so forth. Unless you are trying to use shared coordinates of something like that, as long as say the electrical team links in the arch model and then places all of their components based off of that linked arch model, everything should line up. When you link in a file, that link should be Pinned to prevent it from moving.
Question 6 - i think you are getting the two terms mixed up. Worksharing and Linking models are two different things. Both can be used on the same project. Files are workshared to allow multiple team members to work on the same model. Linking allows the teams to see what work the other team has been working on and coordinating their work with the other team members.
question 7 - see above - it is a comprehensive workflow. The NFL stadium I worked on, somedays we had as many as nine different people all working on the structural works. Workshared project with multiple links from arch, Mech, Elec, Plumbing, Signage, etc. We all knew each day in what area that person was going to work on.
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