here we have a photo of one, supposedly. the owner claims hill m6, I don't know. it looks like a photo I found on the web so maybe an m6 cab with completely different speakers and drivers. renkus-hertz horn, unknown mids which look like coaxial speakers and woofers. All speakers are 8". it sounds big and controlled for such small speakers. I don't know much more off hand.
edit o.k. here we go. Rhenkus Heinz 3301 driver and horn, tannoy mids and volt lows. the volts are 10" unknown size for the mids. might do more searching and build a pair...