echoemb, what size quilt are you trying to make? will you be doing all of the blocks? the reason that i ask is that, with 6.5" blocks and not making any other changes to the sashing or height of the tris, your quilt will turn out to be 110x110. your tris would then be 7 wide by 8 tall. if you want to keep the tris in the same proportion as the original quilt, they would be 7x11.5, making the quilt 117x117 - very large indeed
if that is what you want to do, it would probably be best to get a custom tri ruler made, as previously discussed last week
custom ruler