How can I make pepakura models for my size?

I'm making an Ironman costume, and I'm going to do it with Pepakura. I downloaded the files, but I can't get it to my size. I saw that there is a formula to calculate the percentage of the resize, but it's for Master Chief. Can somebody help me?

Get Pepakura EDITOR - the free version doesn't let you save, but with the editor you can rescale the models in XYZ
Check out the list of instructables on the right side of this page. Looks like the 3rd one down may have the info your looking for.