I almost always buy vintage built ups for the purpose of rebuilding/restoring them. Lately though, I'm starting to appreciate some of them as a type of "folk art" and worth preserving or enhancing. That's the route I took with this 40 coupe I bought.
It just didn't look finished to me so...I dug up some vintage period perfect parts and decals from my stash
and finished it. It's displayed with this original box that I had.
Then there's some builds like this Lincoln, that I think looks great just the way it is, I just cleaned it up a little and will probably stay like this.