I wrote my BB's last line (and most of the epilogue) late last week and I love that one just as much.
Now I just have to re-write and edit the 50-odd-,0000 words in between into something resembling a coherent, interesting story and my first spn_j2_bigbang will be ready.
I'm using a story I started over 10 years but never finished. It will need a fairly substantial re-write to get it heading in the direction I want it to go, but I should still be able to use about 80% of what I've already written, just with some minor character changes. It's amazing how well the general premise is fitting in with the SPN universe. Plus with a minimum 20,000 words needed for the BB, I have over 30,000 extra words to play around with so am unafraid of using the delete button when needed.
So full outline has been completed. I know pretty much what happens to who and when and how and why. I know who lives and who dies and who kills them!!
Wish me luck, f-listies cos I'm certainly gonna need it.
ETA: If anyone is interestered in cheerleading me along or doing some form of beta, let me know in comments or PM.