I liked this story and I really hope that you will finish it.
Just one thing: at the end you say that you plan to set this at or near the end of the Manga, which would make sense since Nodoka is around and everything, but I would suggest not setting it to late into the series. It means that you will have not so many characters to deal with when you already have everyone from Ranma and Sailor-moon and it would also make it easier to break up Ranma and Akane if that is what you plan. It would be very difficult to belief for anyone who has read the last couple of Manga that Ranma and Akane do not actually love each other. Perhaps you should throw out Nodoka and place the story a lot earlier to avoid such problems.