No worries! I used those thule rack straps (used to hold windsurf boards and kayaks to roof racks) to bend things into place. For example, I used them plus clamps to bend the sides around the bow. I also used them to pull the stringers together enough to let the bottom drop down onto the stem. I started panicking a little, but then I posted on the yahoo mailing list, and everyone told me to keep plugging away. Obviously, everyone sorted out what I did wrong and then helped me come up with the best solution.
I am a little puzzled though. Did you clamp the sides to the jig? The contours on the framing pieces should have given you close enough to 12 degrees. I needed to help my bottom meet up with the stringers, so that should not be problem. Worst case, when you flip the hull you can fill those gaps with fillet.
I would wrap those straps around the bottom and the jig and cinch away. Could also do it with a spanish windlass, or a come-along.