I'm always here somewhere!
The BALM/Dulux paint catalogues of the time list Gunyah Grey (Dulux 7883) as official colours for 1956-57-58. The greys used before this were Glenburnie Grey and Gypsy Grey, and afterwards Seagull Grey and Misty Grey. However older coloues often carried on a little longer as old paint stocks were used up.
http://www.clubvw.org.au/vwpaint
Ordering a birth certificate from Germany may not be a useful thing for Australian-assembled cars as the German archives do not have the Australian production records (these no longer exist).
I have been hoping for a while that someone in Melbourne could track down Laurie Whitehead's family and see what happened to him (I know he has already passed away) and his cars. He began as a Melbourne newspaper journalist and became the most successful of the VW 'round Australia' trials drivers. He won the 1955 Redex, and the 1957 Mobilgas, and was also the best VW in the 1954 Redex (won by Gelignite Jack Murray - Laurie finished 13th). After he retired from trials driving he opened a VW dealership at St Kilda, which he owned until about 1965 (after that it became Smiths Motors). I dunno what happened to Laurie after that. Today his legacy has been somewhat forgotten, overshadowed perhaps by his good friend Eddie Perkins (Larry's father). Who knows what became of his trials VWs.