George Whitefield’s Pulpit

Watch this one minute video about George Whitefield.  Notice that the Museum of the Bible has a replica of his collapsible field pulpit.  I have been wanting someone to make a replica of this for years.  I wonder if there is a way that we could get a blue print of this pulpit so we could make other replicas to use at our events?  Maybe someone who lives near the museum could ask for their blue print or the name of whoever made it?