I've included an example of how I created the domes to the left. The pic (which is included) shows the vertex problem that occurs after saving/reloading.
Here's the thread where I've been trying to get help.
https://twhl.info/thread/view/11992Edit Jul. 20 - Sry, should've mentioned, this is a source map. It's just brushes, so it doesn't really matter what u load it under.