Hi Gregory,
As Tony said, Dimarcha was in the December 1965 issue of Model Maker and Model Boats and I have a copy, but would like to hang on to it. If your Australian copy doesn't work out I could send you a photocopy of the two pages from my magazine. Let me know if you need that at any time in the future. I could probably work out how to scan and send them if required!
I was at the Warwick show last week and saw a very nicely built Dimarcha there.
Ian