I used the tutorial here: http://u-handbag.typepad.com/uhandblog/2006/12/purse_frames_de.html
, to make my bags. It isn't too hard to use the frames, its mostly making sure that you measure everything really carefully so the bag fits into the frame. Once you sew one, it gets a lot easier, especially if you use the same pattern.
Right now, I get my frames at a local store in Toronto, called "The Workroom."
And the length of the metal frame is 20 centimeters, and it is about 17 centimeters tall.
Also, I'm still using the fabri-tac glue, and it seems to be working pretty well.