Dina Pappas owns my LQS, Dina's Cozy Cabin. :D Her technique dose work. Even if you miss and don't lay evry square quite straight the finished project looks great.
I tried the technique on the bib and pocket sections of a of a apron using 1 1/2" squares. I gridded my own light weight interfacing for the project, then machine quilted the finished bib block using preshrunken flannel for the batting. The pocket i quilted without adding the flannel.
I did find it easier to lay a section the size of my iron the best. My project was small so I laid out all the pieces on the inferfacing. Just after I started ironing the phone rang. While playing with the dog, my nephew bump the ironing board (the iron was on my sewingtable). That was enough for me.
Susiekate