Questions:
1) After the four light/dark units are sewn together, each of them is approximately 4.5 x 5 inches?
2) When I make the "pinwheel" - I line up the seams in the middle and the outside edges will be uneven?
3) I trim the sewn block to the proper size after it's assembled?
I noticed you are using squares with pinked edges. How/where do you make the seams? (I guess the "how" is - with a sewing machine, duh!) I don't know exactly how to word the question - how far from the edge of the pinking do you sew? I can never decide if the outermost V or the inner V or the middle of the V's is what to count as the "edge" of the fabric.