Hi John, what a shame ! And thanks again for the photographs - each and every one helps.
A copy of the Ray Hollings diagrams can be downloaded from Arizona Models
Machine Guns
Now these have a scale on them, but no dimensions/tolerences etc, and since they have been scanned in I would expect some slight distortions.
I have also bought a copy of plans from the Smithsonian. I'll try and find a link to that tonight. best regards,
Alex