Hi ..

Although it doesn't contain actual blueprints or drawings, with thanks to Advisory Panelicon members Lance, Son, John Thorneicon, Wheaty and Jollygreenslugg for their assistance, there's an entry in the Australia - Milsurp Knowledge Library (click here), complete with a 222 picture photo montage. The photo montage has LOTS of close ups of the scope mounts taken from different angles

Australian No.1 MkIII* H.T. Sniper Rifle (click here)

c/w matching serial number A.O.C. Model 1918 (3x) Scope
(Mfg by Australian Optical Co., Victoria)

c/w Canvas web sling with an inside layer of hard plastic (latex?).
(Mfg in 1941 by B.H.G. Ltd)

This is one of only 481 rifles (short bracket) converted by Lithgow and this particular rifle is documented as having been sent to stores on Sept 19th, 1945.

There are several follow up sections with additional pics noted in the "Collector's Feedback and Comments" section of the main library entry, covering the progressive numbering of mounts and what to look for, pics showing font and stamping examples with extreme close-ups (helpful in spotting incorrect or reproduction components), a discussion of the WWII ersatz canvas sling, a discussion and pictorial comparison of "low" and "high" mount versions of these rifles including A.O.C. scope markings, plus some excellent videos of another H.T. sniper rifle currently in a private collection and also a tour of the Lithgow facility showing video of their internal H.T. collection.

Hope this helps get you started...

Regards,
Badger