Hi Boxon,  Here is the link to the post where Rod shared the file I use as a demo in the video:  And here is a video of how I think he did this, but of course I am open to suggestions if there is a simpler way. Hope this helps.     With Michael's tip this works much better.  Not quite sure what the rules are or where they are written but boxes seem to play better on a roof than solids.  
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