Hello SelArom -
That is exactly where I started. I created a master page with content containers. In that master page within sitefinity I loaded the navigation widgets. Then created content pages from that master page.
Unfortunately, I don't think that video addresses the issue. The problem I see is that is an "editor" can still edit all of the layout regions in the master page from within the content page. I want to be able to lock certain zones down from any kind of layout/widget changes to protect the integrity of the design. I've tried to explicitly set the permission on those nav widgets and also denied rights on the editor role. There is no change in functionality. See attached.
From within SiteFinity, I also created a secondary child page template from the master page. Then created a content page from the child page template. Logged in with the editor account, and that account can still wreak havoc on the entire design.