...would be nice to have access to those parts
It looked like 860s and Pantahs so around 1979-80. The last of the hand assembled Ducs.
I'm told there was 8 man hours in the assembly of a Duc twin, one guy could build one motor a day... think about that for a minute.
The timing cases were assembled by women. They're much better at finicky work. The cam timing on a square case involves about a dozen gears, all of which have to be shimmed to get proper engagement (the reason everyone is afraid of working on a Ducati).
I've never worked on a 860 (too new for me) but if I was doing a bevel timing case I would block out an afternoon.
The women could setup a 860 in less than a minute.
IIRC ducati made about 4400 round case and about 5400 square case bevels.