Hi Matt,
I started sailing in Portland in the 80's, and can fill in some names and probably even find some photos :

El Gato 3 was sailed by Gary Hein - maybe Leigh's Dad? Maybe the sail number was 752.
Greg Lindsay sailed BS & T
Rodney Barker sailed a Mozzie Mk 2 - cant think of the name at the moment, but I do remember him repairing it more than once!
Other boats I have memories of are Seabird - Maybe sailed by a guy named Greg ?!? and Mozzie number 444 called Double something or other (from Warrnambool?).
There were usually 3 - 6 Mozzies sailing at Portland in those days, I was sailing an Arrow (1265) then and always last in the fleet!

Lots of blanks in the memory, but some old photos helped a bit!