In fact, I think I am enjoying the drafting part as much as the sewing.
Lori's tutorials not only show you how to draft, but also include piecing instructions.
One of the nice things about piecing blocks is that many techniques work well.
In drafting, each square equals a 1/2"
As you can see the A/B square is 2-inches finished.
I like to use the technique where you cut both fabrics 7/8" larger than the finished size.
I cut each square 2 7/8" X 2 7/8"
Draw a line from corner to corner, and then sew 1/4" on each side.
Cut on the drawn line.