I have that book and I am slowing making the same quilt. In this book she just uses the traditional way of sewing 3x3 corners to a rectangle 3x5&1/2 base.
I sometimes use the larger square base 1&1/4 times with the (4) small squares cut 7/8 larger than the needed size.
hers for the pattern are (4) 3x3 and (1) 3x5&1/2 so it would be a large square (1) 6&3/4 and (4) 3&7/8 x 3&7/8.
http://quiltingmemories.com/PDF/Fast...ng%20Geese.pdf
I always have to trim the quick method more so I just go with the traditional square on each corners.
Cutting out the 616 squares 3x3 has been fun lol!!!!!
I remember the posting you are referring to and I bookmarked the page in her book after seeing it, but I can't find it either, if I do I'll post it.