Hi John, will check into availability of parts book reprints, not sure who is doing them now. They are by no means complete on the picture front tho, unlike say a 1970s Triumph parts book. You can find what the originals look like in the members only area of this site, if you go to the parts lists section and click on illustrations, that will show you what is in the factory parts book.
The shop manual is still available, will look into that link for you.
Also worth a browse of the Walkers website for pics to identify parts you need, so you know what they look like if you come across them at a swap meet.
I have a pretty exhaustive collection of pics taken for reference over the years too, if there is anything particular you need a picture of, ask away.
cheers,
Tim R