For those interested in further reading on the matter, here are the links to the Defence Department 'Freedom of Information' (FoI) responses which solicited the KPMG analysis report quoted by the ABC article linked to above.
FoI Response - 'Staement of Reasons'
http://www.defence.gov.au/FOI/Docs/D...tOfReasons.pdf
KPMG Report - 'F-35 Cost Study on Corrosion Mitigation Options'
http://www.defence.gov.au/FOI/Docs/D..._Documents.pdf