Bonjour Captain.
1. You two have become addicted to MBC.
2. For me, this alternative is not acceptable for a simple task like this (to make some simple rectangular holes on the face of the roof).
The RG plugin (5.1) with the Roof windows library (0.3) have to be enough for this.
3. I need your sample file to investigate the issue.
If the plugin or the roof windows library is the culprit, I need to fix them.
So if the user's got it wrong, I gotta fix the user manual.