Making Stained Glass - Narrow window question

I am making a window for sidelite next to a front door. It is 8" x 80". I plan on leading it, as I think it is the strongest method for this size of window. Would I have to reinforce it in any way? It will be put over an existing window and trimmed into place.

Thanks for your comments.

Milly's reply:

Thanks for your question Linda, it's an important issue. As you suggest, the window is narrow enough to not need much support. However, I would integrate pieces of lead came about every 18" with a steel core into your window. Make sure they go the full width, from one side to the other. They do bend a bit, which is helpful when making stained glass, especially if your design is curvy!
That should make it strong enough so that it doesn't sag. Hope that helps.