Happen to notice these while Googling about for info. Thought people here would find them of interest.
(http://forums.pelicanparts.com/uploads18/M51_cutaway_11299553989.jpg)
http://forums.pelicanparts.com/uploads18/M51_cutaway_11299553989.jpg (http://forums.pelicanparts.com/uploads18/M51_cutaway_11299553989.jpg)
(http://forums.pelicanparts.com/uploads18/M51_cutaway_21299554010.jpg)
http://forums.pelicanparts.com/uploads18/M51_cutaway_21299554010.jpg (http://forums.pelicanparts.com/uploads18/M51_cutaway_21299554010.jpg)