I love the Stack-n-Whack technique but have never made one. My g/f bought me the fabric to make one and gifted it to me for Christmas (that would be 2 Christmas' ago now) and we've finally decided that next month we are starting on it in our little group. I'm going to start with the Stack-n-Whack and then do a Four Patch Posey, which is similiar but with only 4 repeats.
Darn old fashioned cardboard templates. The UFO I'm fininshing (due at the guild meeting next week) was made with those. After 15 years I still had a ton of cut out units and I used them to make the border. Some of the unit pieces were an actual quarter inch smaller than others. :shock: I am so glad we have graduated to better tools than what our grandmothers and great grandmothers used!