Back when I started editing, revising, in some cases recreating certain of Dad's stories, I made up some rules to guide my behavior and to calm critical and fan concerns (though some will still freak out no matter what ... some still think editors only fix spelling and punctuation).

So a completed and previously published story can have a certain sort of minor change, depending on the seriousness of the problem that I'm trying to address.

A completed but unpublished story has slightly less strict rules and an incomplete and, therefore, unpublished story has even fewer.

In all cases I assume that it is better to cut than to add. And, if details need to be added by me, I try to find things that came out of Dad's life or out of research or books that he was dealing with at the time.

Obviously, style has to be matched. I've had a lot of blowback over No Traveller Returns because, of course, it doesn't read like his westerns. That was never the model, however. The first draft of book itself and the extended universe that it exists in, that of the Yondering stories, has to be the basis for its style.