This is the most complicated part of the build. The rocker sides have 2 angled dadoes to support the seat and back, and another dado for a strut up front. The dadoes for each side need to be fairly accurate for the two sides to join up squarely when the rocker is assembled. Jeff Miller's plans (PDF page 7, as shown)
show an elaborate way to measure the exact radius of the rocking curve, the curvy splines for the sides, and the exact location and angle of the seat , backing and strut dadoes. While these measurements are incredibly helpful they are also very labour intensive to scribe onto the plywood (since you have to do it twice, once for each rocker side) as well as scaling a side-panel.
I decided to forgo the calculations shown in the original design. Instead I copied the page showing the calculations for the dado jig and the side panel pattern and combined them making my own template to trace from. Using this method I only need one template for both sides by flipping the template over.
You're welcome to calculate the angles yourself, or you can use the files I've provided to just print your own template. While the outline of the side panel can be scaled from the template I've provided you'll need to ensure to match your dado thickness with the thickness of your plywood.
After downloading the template or calculating your own, print/scribe your plan. If printing, you can use a plotter, laser cutter, or on your home computer using a tiled printing
method like Block Posters
(aka Rasterbator). You will only need one rocker side template for the printed method as we can just flip it over to trace the opposite side.
Download the PDF (below) or select picture 2 (above) from this step and "save as" to your computer.