Two great tutes for scallops and binding them
https://ankastreasures.wordpress.com...ding-scallops/
and
https://ankastreasures.wordpress.com/2012/02/23/a-tutorial-on-scallops-part-2/
I tho't this was the site I read about taking a strip of newspaper the len gth needed, folding, and cutting scallops to mark the top. I sidn't see that info when I quickly scanned the article just now, but sounds like perfect way to figure it out. I've had this bookmarked for a long time, but haven't tried it yet.