State Library of Qld holds these books about the CCC or Allied Works council.
General information and conditions concerning the Civil Constructional Corps, State of Queensland / Allied Works…"
Try searching without the SN because some don't have numbers eg. Lieutentant, Depot etc.
If you know his full name that helps or he may be spelt with a Cavanagh.
There are a number of Kavanagh's from Qld just 2 need to add…"