for those interested I just found out that Ben Heck's board set - the pinHeck Board Set is being used on the this game as is in the America's Most Haunted and Pinball Zombie's From Beyond the Grave (which is still in proto-type stage). At the recent expo the board set played played over 700 games without fault in the Pinball Circus proto game.
That is a feat that I don't think will ever be repeated. Given it was not the full playfield, it is still a great demonstration of reliability and field testing success. I can't wait to play one of these "grail" machines. Thrilled with the progress.