[QUOTE=bearisgray;8723500]why not leave the panel intact and applique strips for the muntin bars between "window panes?
You could still do a mock layout with paper strips to get the proportions and spacing right.
Then I would mark it with white chalk or ivory soap for where to put the strips.
You might consider doing fusible applique if this is going to be a wall hanging.
Or just quilt it like a mini-quilt to accent the car, put a quilt rod pocket/sleeve on the back, and hang it from a rod .
Also, make sure your panel is printed on-grain. If it is way off-grain, some people will say to just quilt it down and live with it.
If going with the fusible applique technique, wash your fabrics first so the pieces will hold together better.
More than one way to achieve an effect!