Cut the ends off the watermelon so you have a flat base to work on.
Choose 2 plates, bowls or discs that you can use as a templates to cut the watermelon circles. I used a bowl with a 5 ½" mouth and another with a 4" mouth. Use any size that fits on your serving platter and allow for a 1 ½ - 2" difference between the width of the 2 layers.
Cut the watermelon horizontally in to two pieces about 3 ½" deep each. Heights can vary.
Ensure that your templates fit well within the pink flesh area of the watermelon. Using the widest template cut straight down to remove the extra watermelon and rind. Repeat with the smaller disc. Ensure no white part of the rind is on the edge of your watermelon tiers.
You may need to trim the two wedges to make sure they are perfectly flat. Trim as necessary to ensure your wedges are perfectly round.
Transfer and center the watermelon base on to the serving platter you plan to use.
Break the skewers if necessary so you have three 3-4" 'posts'. Position them vertically around the center. (About 2" from the center). Leave about half of the skewer sticking out of the bottom layer.
Center the top watermelon tier over the first and press down gently onto the skewer 'posts'.