@thesunfloweramazon yaaaaaaay, questions that help me plan ahead! 
Here’s hoping I can make the different character combinations as much fun as I want them to be. Poor Merlin; no trust bar. ): This will actually be after Mordred’s conception, but taking Arthur and Morgana ought to give Guen an opportunity to help them reconcile (not the only opportunity, though). Part of the reason I included the option for late-night drinking with Morgana and Arthur after the sheep-chasing was so that Guen (and the reader) could spend a little time with just the two of them before all the Mordred stuff happens.
The forest is planned to be vaguely in the area of the Cairngorms National Park in Scotland, but it will have more trees (due to being enchanted and all). It’s the narrative equivalent of Broceliande, but I’m a bit stuck on whether or not to call it that. (I’ve also considered calling it Darnantes.) I’m trying not to call most places by their present-day names, with a few small exceptions like Bath, because this is fantasy, and the geography is meant to correspond roughly but not exactly to the “real” world – so I’d feel weird calling the enchanted forest by the present-day name of any actual places in Scotland, since that just invites criticism from “accuracy” zealots. In terms of adapting Arthurian lit, I have no problem lifting Broceliande from its more usual location on the continent and dropping it into Scotland, but I have no idea if superimposing a place-name more associated with the continent – albeit a Celtic place-name – would be offensive to present-day Scots somehow? idk, maybe @FairyGodfeather could answer that question?
I have a short list of things I want to include in the enchanted forest, but I’m open to suggestions! Right now there’s already a pond/fountain sort of thing that plays a major role, and a few specific magical creatures that I definitely plan to use. But there’s also a big chunk of the outline that essentially says, “random enchanted forest stuff happens here.” So if anyone has any favorite random enchanted forest stuff, especially if if comes from Arthurian tradition, I’d love to hear it! (obviously with the caveat that some things won’t work with the overall plot, and I can’t do everything.)
Part 4 did change, massively. I decided that having Arthur get kidnapped so soon after part 2 would feel repetitive, since Guen already had a chance to rescue him once (though an Arthur constantly in need of rescuing could be humorous, I guess). I also decided that I was going to do something with the grail after all, which changed a lot of things in the master plan. Also, people were asking to visit Avalon, which I didn’t have a specific plan for. So now part 4 is going to be on Avalon, with the grail, and Elaine, and child-Mordred, and probably an appearance from baby Percival and child-Lamorak – though everything is subject to change, of course!
And yes, Lancelot’s motivations for marrying Elaine have become more ambiguous, so I took out the reference to him being unwilling. As for Pellinore and Lot, they’ll both be around in part 3, but the conflict in the later parts will be between the succeeding generations of their families. Guen could indeed end up feeling torn between the two sides, depending on how she feels about the various people involved. (In case you’re wondering, the current plan is for Elaine to be the daughter of Pellinore’s brother Pelles, while Percival and Lamorak are her much younger cousins, sons of Pellinore. Percival and Galahad will therefore be first cousins once removed, but only a year apart in age. They’ll also be about the same age as Guenevere’s child, if she has one.)
