Thank you all!
If interested here is the video I used as the main reference. Very hard to find old paintings or manuscripts with them in. If you read some of the comments apparently the maker of this ‘channel’ is actually a very well off co-founder of a major game company, presumably doing it as an interest.
Clearly, as I mentioned in the entry post I need to do some bending and un-straightening of some of my parts yet. So far I have not added the rawhide ties he had on his, I am unconvinced of their likely use being as they fail in the wet. Simple joints I believe would be more probable. Or possibly both. Doubtless, there were thousands of variations they were not factory made!
There is this Bruegel with lots! Somewhat different, bigger more refined narrower wheels probably related to the more urban situation? Including the use to move barrels to the local pub!
Why are carriage wheels dished? Took more research to discover, that it is to counter sideways stress on roads with a side tilt, and probably the effect of turning. Wheels can break sideways as their weak point. The dishing means the struts go vertically down onto the rims when some degree of side tilt is acting on them