Certainly there are cases like this, and we offer alternative solutions for folks who need them for security reasons. So far, I haven’t heard that a self-hosted WebGL viewer is one of the things that folks in this kind of security environment need. Certainly cloud-hosted applications of any kind are problematic for such installations.
I think what @tim7 actually wants, however, is a way to share models privately with only a selection of users. A cloud-hosted solution with a built-in sharing security model (like Google Docs, or Trimble Connect) is perhaps a better solution. Today, it is possible to share a model from Trimble Connect with a restricted set of users. You need to do it from the Connect web interface, though, not from within the SketchUp application. And of course your models have to be shared to Connect in the first place.
Here’s an example model in the Connect application. The model view is a full 3D view:
And here is what it looks like to invite someone to view the model. Any functional email address will work, though users who do not already have Connect accounts will have to make them (for free) to view your model.
