Lipster, (and anyone else that may have problems) well, curiosity got me so made up the top half of the new block. First one I used the template printed, the size turned out fine. Then I wondered if I could use my Recs tool, of the Tri-Recs set, and measured the paper template. It was perfect cutting it at the 4 1/2" line on the tool. So far so good, top half measured correctly too. I always use a scant seam allowance, would rather trim than not have size correct. Make sure the sheet you printed off w/the templates on it measures up...the little square shd be 1".
I hope you can get it to come out correctly - but if it doesn't work out, don't worry about it, it's just an extra block..