Here is the link to the Schematics if anyone is still interested.I took them in Hi Resolution so hope you can see what your looking for
http://s936.photobucket.com/user/4strings4fingers/library/Sunn 1200s Schematics?sort=3&page=1
Thats great.
If you ever get a chance to do copies of these, would you send them across the pond to OZ?
Cheers