I wonder if this has been done before
There was a multifandom challenge a while back, to write AU stories where a character was a brain in a jar hooked up to the inner workings of a spaceship (or, in one case, the author went for a retro feel and had the character in question wired into a highly experimental WWII fighter plane), and some of the results were pretty awesome. There's also a mecha anime series out there inspired by "A Little Princess." So I was thinking, "hey, why not do a multifandom ficathon based around the idea that everything's better with giant robots?" It would be an opportunity for all kinds of fun, especially if you didn't decide to do the "AU in the future in space" thing and designed some tech that meshed a bit better with the original setting.