Good points. There's no right or wrong answers here, which is the important thing.
I've bolted a lot of bits to mine which I, PERSONALLY, deem to be improvements to MY OWN bike, in order that it fulfills what I want from a bike. It's not up to anyone else, is it? Although obviously it's nice if people like what you've done.
It can be a shame if someone goes absolutely mad with modifications, think streetfighters or 'All the Gear, No Idea' type butchering jobs, on a machine which is now becoming very rare, but even in these cases, no one else should judge the owner. After all, if it makes them go out and use and enjoy the bike more, QED.
I think what we as 888 custodians (we never own, we just look after for the next generation
) will find the most improtant thing of all, with residuals in mind, is to try and at least keep the stock parts in case of the need/desire to return it back to standard. Ok, some mods can't be reversed, but it would probably be a little hasty to change it beyond recognition and then flog all the left over bits after. The market does show that people prefer stock machines, especially with rare stuff. Although sensible small mods like braided hoses probably make no difference.
Anyway, keep the faith and all that!