Excellent stuff for an Eleven-year old.
If I ever get around to putting the finishing touches on my own dubious sequel (just a couple of chaps to go) I'll let you know.
I would suggest stringing the chapters together. Douglas was infinitely capable of the brief chapter, but he never waxed terse. The perspective hops too frantically for a solid narrative perspective to take hold. Try expanding a few chapters, perhaps.
Keep writing (and try your hand at something original as well. Fine fanfiction often equates a superior imagination).