That most excellent chap Sir Dewbakuk – odd name, but a sound fellow nonetheless – is the builder contracted to create the two boards for the demonstrations. I can say without fear of contradiction that what he has shown us chaps so far is most marvellous in its verisimilitude.
You can catch the ongoing saga here: http://www.lead-adventure.de/index.php?topic=51338.0
Just to whet your appetites here is the plan for the board. He has added many photographs of work in progress to the above forum thread.