Step 3: Prepping the Outer Discs....
After seeing my horrifying freehand interpretation of circles, I realized that I could use the mid-point as a guide.
Essentially, I used a drill press and drilled down straight through the "X's" that I left as the center-points of my circles. From here, I inserted a bolt that was about the same size as the hole and added a wingnut that, when tightened, aligned all of the "circles". From here, I started making passes with the disc-sander. The trick here is to keep the piece moving, rotating against the sanding disc.
You can see the before and after shots above.