After the quilting was complete and the binding was added, I turned my attention to the mounting device for the battery packs. When they were merely pinned to the back of the quilt, they bulged out and left the quilt looking pretty lumpy.
I showed the quilt to some of my friends, and they agreed with my husband, that I needed to have a separate piece of material hanging from the top of the quilt that would hold the battery packs. I tossed their ideas around a bit and came up with a solution using swimming noodles and fabric with a couple of casings sewn in it. The swimming noodle was cut lengthwise down the middle so that I had two pieces that were similar in depth to the battery packs.
I sewed a casing a the top and slid the noodle inside. Then I pinned it to the back of the quilt and loosely pinned the second half of the noddle closer to the bottom, making sure that they battery packs would end up being right underneath the second noodle, and near the spot where they come out through the back of the quilt. This is not a false back, which would have disqualified it from bring judged at our show. It is merely part of the hanging sleeve, with an extended backside.
Here are some pictures showing the finished extended sleeve. The quilt will hang on the flat side of the noodle, while this extended sleeve will hang off the rounded part of the noodle, leaving that nice gap between the two. Well, that's how it supposed to work, anyway.