A shame you didn't get to finish it as you left us with quite an interesting situation.
A questions that made me scratch my head however. Why did the future Enterprise decide to join up with past Enterprise if contamination of the time line is such a big issue? Maybe an accidental encounter would have been more plausible.
Otherwise, a fun if open-ended story.
I just read this today, after the contest was over. But I liked it for the reasons Cejay mentioned. It was fun. I hope you revisit this storyline again...