I've only made one, but I made it pretty thin and didn't do a background and it turned out pretty well. I had to do a few touch ups when I got it on the cake. I think as long as your lines and spaces all connect then you shouldn't really have a problem. After mine had crusted but before I froze it, I smoothed the back with a fondant smoother so that everything was "connected". It's the dog in my photos.
The first one I made was really thick. Now I just don't put as much "backing" on. I usually just fill in the low spots when I'm done doing the design, then smooth it out. So far only one has broken, but it was really my fault when I turned it over. Good luck, I love FBCT's!
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