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Misha Collins posted this video about designing the set for an upcoming episode. It includes upcoming guest stars.

Jerry Wanek give us a tour of the building of this set.

 

I'm here with @robbenedict touring an awesome set designed by the handsome, strapping, witty, and soft-skinned @jerrywanek

Posted by Misha Collins on Wednesday, April 6, 2016

I found how they put the sets together to be fascinating. Enjoy!