I'm going to IQF in Houston (Yay!) and one of my classes (Heavenly Stars) is making a quilt block that will be turned into a clock for the wall. The supply list includes 4.5" square ruler/template and a 11.5" square ruler/template. I found the 4.5" ruler, but not the 11.5" ruler. Is there such a thing or do I need to make a template myself? Or do I buy the 12.5" ruler/template and that will work? Thanks for your help.