I have done a BOM. What I found a bit odd is that where two points meet at a straight edge, if you need to trim down that section of the block you lose part of the 1/4" extra bit so the tips of the points will then be sewn across when the sections are joined to make the block. I recall that a couple of people said that they had lost the points.
So that I didn't have to trim, when I divided mine into 3 for cutting I faffed about with 16ths of an inch.