I used a "sprong" for the concentric circle, a pvc pipe for the continuous circle, and a foam brush I notched for the parallel stripes. Then, to create the lines between the diamonds, I used a piece of craft wood that is about 1/4 inch thick by about 5 inches long. Once the wax was hard, I stretched the tank on a piece of foam board I had covered with contact paper, and anchored the bottom of the tank with t-pins. I drew a sketch of the design so I could plot out the color placement. Even with all that planning, I still ended up with a couple of places where the same color was in adjacent shapes, darn it!
Once the dyes have 'batched' and dried, I plan to paint wax over the front and dye the back of the shirt with black, using low water immersion technique. I'll post a picture of the final result once it's done, so check back!