Ian Rabenda:
I'm afraid I can't help with the date of manufacture of your lathe – this is the kind of point that owners' groups are often good at, however. I notice that, unlike the Willson, the Elliott doesn't carry its serial number on the headstock chart but no doubt it is stamped on the bed, etc.
My impression is that, apart from the bed, the major components of our lathes are broadly similar. I have worked on most of these except for the headstock and might be able to help with your outstanding queries. Shame you didn't take more photos!