Hi Stefan, remember when photos were not digital?
This was all done long before digital cameras, so, no I have no pics from back then. TBH I would be surprised if I ever took any, didn't see the need to document stuff I did.
When you ask about how "the hub was supported on the axle" I'm unclear on what you are asking. If you mean the wheel, it was a relatively close fit on the axle. If you mean the drive hub, it was keyed to the axle. If I were doing it now with a different style of wheel I would have bushes, not bearings as they are too free, in the bearing cavities as Adrian has drawn.
It has become more sophisticated as there is a need to match to the different wheel designs (Pitbike, Adrian's artillery and the Honda), and my "back of an envelope" designs don't seem to cut it with the 21st century.
My original just had a steel washer against the wheel, but the man Adrian spoke to felt the need to use high carbon steel which introduced another level of sophistication.