Matt,

Your method is definitely a lot more accurate than mine, but I can't quite envision the template from your description. No rush, but if you have a photo that would be nice. I've found myself more than once thinking '"There has got to be a better way to do this!"

Now, I measure-eyeball-measure-eyeball, and then repeat that about 20-30 times, then have my wife come take a look at it and do the same thing before gluing anything. Pretty good so far, but I always breathe a huge sigh of relief when everything lines up, because it isn't exactly a sure-fire thing.