Bill
You make it sound so easy!
Also the movie in the Knowledgebase makes it sound easy.
The problems lays in that there are different ways to setting doors, windows, window walls, etc up - knowing which class / glazing belongs to each.
Frames end up looking like the wall colour and texture.Clear windows show the internal and extenal walls / windows behind. Etc.
It all becomes a mess and you end up spending hours trying to get each individual window / door right and still it does not work.
We end up drawing over the vp elevation, then have to change things to accomodate revisions - but this is not what VW and RW and BIM is all about.