There is video of Gene's collection/hoard of Bally machines and the BBB production in the "Life After Death III - WAREHOUSE RAID" 2008 DVD from Rob Craig and Steve Rothschild. Rob and Steve started the Silverball Podcast back in 2007 when there was only Clay doing the TOPCast episodes. The DVD is a great watch and I sold my copy years ago but just recently bought another and eagerly await its arrival.
Checkout the podcast episodes here http://www.silverballpodcast.com/