So I'm at ~10.5 weeks, and here's a time-lapse of weeks 2-10 (click image for YouTube video):
I got a late start getting the camera set up, and then for some odd reason I'm missing 10 days between July 6-15.
The far plant (off camera, to the right) has a pumpkin now that's bigger than a basketball:
I think I might have rearranged some of the vines early, but I certainly didn't have a deliberate plan to spiral them. I think they're just sprawling randomly.