My thought would be that we would each read and compare the various texts to the published Sil and comment here without posting the actual texts, but I also think it would get muddled and confused fairly quickly.
Let's give it some more thought. In any event, there is plenty of other things that we can discuss.
Edited to add: Looking at that thread, it seems that Johnboy's goal was a little different - to create a more complete Silmarillion, rather then to simply trace the origin of the various parts of the published text and determine what was added/changed by Christopher and Guy. A comment by Eluchíl in that thread parallels my own thinking about why this project might be possible without posting large tracts of texts (even though I don't fully agree with it):
As you yourself point out in that thread, Scirocco, that is not really fully true; I believe there are some other point in the text where fairly extensive liberties were necessary, but I believe that Eluchíl is largely correct that most of the editorial changes are relatively small edits, which we could point out with printing large tracts of text. Much of what I would be interested in tracing-- beyond those edits -- are what parts were grafted into the latest draft of the Quenta itself from other texts - the Annals, previous versions of the Quenta, and other sources. But at certain points (Túrin's story, the ruin of Doriath, the War of Wrath) that might get too confusing. I don't know.In one of the HOME Volumes (XI) I think CJRT finally does discuss the construction of the published "Of the Ruin of Doriath" chapter. There was no good version availible, and he felt that the stories outlined in Q (1930) and the late Tale of Years had intractable problems, so after discussing the matter with Guy Kay he simply rewrote the story as best he could. While we may disagree with this procedure, it is defensible, and it should be noted that only in this one chapter did he adopt it. Most of the other editorial decisions boil down to discarding a single sentence or changing one word.