Has anyone done the math for one of the quilt sizes? For the lap size it's a 48x54. If you minus the 4.5" outer borders & the 2.5" inner borders the center would be 36x42. It's in a 6x6 grid which make your blocks 6.5" x7.5". It almost seems like a waste to make 36 8"x8" half square triangles. Or is my math wrong? I have to make all those half triangles to cut them an oddball size.