Mark,
i didn't say "making the most of". I said that the reverse engineered drawings are there for making most of the 760 parts. What's missing are the two clamps that attach to the rear way and the bar with pointer and scale that connects the two. I think that the guy who did the original drawings had those parts and only drew the parts that he was missing.
Also, there are three assembly part numbers involved with the three taper attachment models that Atlas made over the years. The one that we have nothing on is the 700 so-called Tool Room TA. Most of the drawings that were done fit both the 760 for the 3/8" and the 6188 for the 1/2" bed machines. I think that the only two parts that only originally fit the 6188 is a spacer washer (to adjust for the difference in height of the compounds between 10" and early 12" and the late 12") and two small brass plugs. The former is not needed on the 10" and early 12". The latter can and should be retrofitted to the 765.
I was aware that the ways on the 6" bed are actually thicker @ 0,430" than the ones on the bed used on the 9", 10" and early 12" @ 0.375".