Quilting G, don't know if this would apply or not, but it reminded me of when I was trying to make the easiest pattern - Warm Wishes. I took apart more seams then I kept, wrote and asked for help on here! Apparently it was my seam allowances! Even though they all measured 1/4, I finally figured out some I had to do a bit smaller.
I can't remember who now, on here, made one up in stages, and gave me the measurements of each stage - which helped tremendously!!
My finished quilt is the one in pictures - Aiden's.
So hang in there, and hopefully someone can figure out the measurements for you too!
:-)