Yes, this Kleinhorn is on the cover of _audioXpress_ this 
month and links are available at Full Range Driver Forum
as well.
   There's another "Big Stuff" project by Nelson Pass called
the J-Lo.  ir was also in _audioXpress_ and features a single
EJ Jordan 92S in avery large backhorn... but at least the 
J-Lo is built out of standard plywood sheets with no bends.
   It's sort of like building an Arc in your basement.
The problems moving such a construction must be considerable.