Very cute and flattering! I used elastic thread for the first time this past summer, and I was happy to find it much easier to work with than I had thought it would be. I also loved the flexibility to pull the thread tails till it fit the way I wanted and then stitch them down.
Aww man, I knew I should have printed out the tute while I could see the pics! So disappointed the links to them are broken now. I'm in the group of people who would be eternally grateful if they could be fixed or re-posted, now that I'm actually ready to sew myself one of these! Such great inspiration (as can be seen by the number of posts of people who've made their own from this tute).
I've found that - if you don't mind the fumes (which is one of the big things the Gutermann doesn't have) - the E-6000 works well. I've had a few frame clutches I've made with this for a few months now, and they've held up quite well. The nozzle is a bit bigger, so you have to be careful when applying it to the channel, but I've found that less is more on that anyway. Also, not sure if you've read this tip already, but letting it dry for 3 minutes or so till it's tacky and not wet anymore, and then pushing the fabric in makes a huge difference. I haven't found the need to crimp at all, which I love since I don't like the look of it or of sew-in frames.
I agree that you'll probably want to interface with at least a medium weight. The other question will be if you want fusible or sew-in. That'll be something to think about when you do your interfacing sandwich. The design of your bag will affect that decision as well. Good luck and let us know how it works out!
Gorgeous job on your bag - looks very professional, especially with the grommets and leather. Just curious, what kind of foot do you use when you sew with leather? I'm trying to decide between a rolling foot and a walking foot. Thanks! (And great blog too - so nice of you to share your secrets!)