What an awesome effort, David.
Are you having treatment for Carpal Syndrome?
Of course we'll keep feeding you any discoveries we make along the way...
I'd also like to find the codec for the GM-H WO numbers... we have some, but it's been a matter of deduction mostly. They refer to the "War Office" body designs.
Oddly it was a Holden only practice. The Army preferred to use the MVFS (Military Vehicle Field Specification) series of numbers to identify and specify all their vehicles, as used in the DMV book I've just produced.