I know I couldn't do it justice just yet.
I need to get better at large ensemble cast stories before I could even think about it. Even then I'd want to use my own characters and put my own spin on slowly but surely a small cog becomes a big cog, and one that rights the machine.
the only way to really get good at 'large ensemble' writing, is to experiment, Monbvol. One of the reasons I do it, is I'll hit a 'stall point' with a given character, so I switch position or perspective while part of my brain is still trying to work through, and hit the 'what's going on with x,y, or z characters?' button.
usually frees up the jam a bit and advances the over-all story. (best examples would be the battles on Tharkad in "The Horde Returns" and then, the feddie front's action in that same story, interleavened with Liz doing politics).
basically following Stephen King's rule as he outlines in his nonfiction work "Danse Macabre", which breaks down to 'write SOMETHING every day' (his rule was to start off with a modest goal of three words, this usually turns into a sentence, then a paragraph...)
Now, most of the really GOOD fanfic writers (which doesn't include me on that venn diagram, as I write some pretty out-there shit) do it the smart way and do their work on Word, OpenOffice, Google Docs (which is great if you're working with a collaborator as it includes a chatroom function so you can communicate realtime), or some other word-processing system that lets you do your spellchecks and editing before subjecting other people (in the audience) to your scribbles.
I post 'cold' which means that an observant type, can catch my thought process as it happens. (Which, I guess, is a little like performing live-you get immediate feedback if people care enough, but
Everyone sees it when you screw up.)
My better stories don't follow this most of the time, but then, I've found I actually have tended to do better work when collaborating with someone else.
I attribute this mostly to the imposed discipline needed for cooperating with someone who has (most of the time) a real life that isn't 'go to work, come home, kill time, sleep, go to work'.
even there, I make an effort to follow King's Rule and always get at MINIMUM a sentence or two done per day no matter how blocked I'm feeling.