I had the same problem, luckily I had some extra material to use. Unfortunately, don't expect a reply back. As well as the instructions are laid out, they kind of leave the kit "as-is" and your SOL on support issues of almost any kind. As far as they are concerned all issues have been addressed in the book or instructions. They've even been known to black list people who write in reviews or even post on forums regarding minor criticisims of their gear.
There are a few things I wish I'd known before I made my quilt. First, if you consider yourself a person who tosses and turns, quilts are probably not for you, at least not without a bivy which negates the weight savings.
Second, the concept of using a quilt in the summer is completely different than that of a winter quilt. I built the 10 degree version and unfortunately the slightest movement and lack of sufficently sized draft stoppers are a huge problem and lead to nights of extreme discomfort. Ray's response in his books has been that "you'll learn in your sleep to stop turning" but that pretty much only worked for him judging from stories from others, if you move in your sleep, you'll just get hypothermic.
Third, expect the quilt to be 3 times the bulk of a down sleeping bag of similar ratings. Simply put, I didn't have room in my pack for the watermelon sized synthetic 10 degree quilt.
Fourth, Sil nylon is not breathable and as such is not comfortable against bare skin in humid environments. Wear light a base layer even in the summer to prevent sticking to it.
All in all, I used the summer and winter quilt for about a year before determining a hooded bag system is far more failsafe for my endevors where getting cold had consequenses. Thanks to my location and packing methods for trips, I rarely am in sustained wet and even when I am, I have never had a down bag fail on me. Quilt wise, I found the Jacks or Better down quilt far superior in comfort, flexibility, weight and compactness, even still I found a bag sysem more ideal for colder temperatures.