jaba -- here's the pattern I used. It was one I copied from goodness who knows who or where though. I have paper copies just shuffled together and don't know where they came from. Not a good system but it's too late for me now
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[ATTACH=CONFIG]361233[/ATTACH]
I put the ruler by it so you could see the dimensions. You might be able to print it out and go from there.
Glad y'all like it. I think it makes up real nice. Be sure to use "scant 1/4 inch" seams or it won't turn out 12.5.