Interesting, Tony, well spotted. Can't say I ever delved into the history of the mount in any detail, so that's a revelation to me. But they were certainly made in Australia to be mounted on the Inter No.1 Mk.1 - perhaps the legs were re-designed to fit? In any event, it seemed like such an awkward contraption!
I accepted one for the AWM collection, which sits in a shelf in storage at Mitchell. Don't know if it has been cattle-dogged as yet - it was pretty far down the list.
May be you could send those images/references to the AWM for their interest,for when they do get around to looking at it in detail?
Send to the Duty Curator at
MHT@awm.gov.au
Mike