Sorry to revive an old thread...

I just built my first frame bag based on lots of ideas from here.  I used the shockcord method all the way around, but did include stiffneners to experiment with water bottle cage attachment also since I'm trying to get my ideas sorted for the best possible execution of version 2. 

For those that did use the water bottle method, how did you finish the holes in the fabric for the bolt pass through?  Buttonhole? By sewing a little circle or box around the edge?  Some sort of grommet?

Thanks!
Gus