I printed out the drawing from the site that I linked to above. The drawing is alittle hard to read but it gives all the diminsions for the 14 inch version. I just took them and drew them out on a piece of cardboard, cut that out and there was my template. If anyone wants to borrow my template they are welcome to. the most important part of it is getting it squared up. I found that to be the easiest by making a perfect + on the pattern and then working from there with the measurements.
Jeff