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I am looking to see how I can copy and paste table from one project to another. How are projects merged? How do we do development lifecycle where the same table is in different environments?

These are end users who need to see the models. We might even really know them personally, other than they work for the same company. So a "viewer" of models at some URL is very powerful.

That's cool. Are these Collaborators part of pricing? Do they need licenses? we obviously know all the modelers need licenses. 

If Export image is limited, is there a "VIEWER" option in the web for users who are not licensed? Typically in case modeling tools, we only want the data modelers to have access to the tool functionality, but want users to be able to see models that they are ready to "publish". This way they understand the structures they are writing queries against.