Please forgive me John, if I’m wrong, but I suspect that you’re getting at the fact that not only were errors in parts books through simple silly mistakes, but major errors exist due to differences between manufacturing practice and design.

I’m thinking particularly of the rocker spindle/washer arrangement, that you have mentioned before.
As the changes weren’t done properly by Triumph in the first place, how would original part numbers help?

I think it needs to be much more than a simple database, it needs hotlinks to deal with specific issues.
Not every issue is absolutely resolvable, say different valid opinions exist, so such links would enable folk to make a judgement.