The file work around is a helpful idea.
It doesn't work to well with Skype and a large model but with this client I'm doing screen shot videos of the model with voice-over to clarify the design. I post it to YouTube and send them the link. It allows them to view it when they can, multiple times. I've done this with busy clients that are hard to pin down, it works pretty well. With this particular design I'm becoming a better video editor and director, I have to plan all the outside and inside shots, cuts and voice-overs The separate file idea is a great workaround for this.
It's a pain for live presentations and building 70 or 80 custom openings is out of the question. Was hoping one of the clad window manufactures had already addressed this. Oh well!
Thanks for the help!