I checked the prices at my local Lowes and it was around $8 for a 2' x 2' x 1/4" plywood panel. I checked the full sheet plywood area and found a 4' x 8' x 1/4" sheet for just under $16. I had them cut the sheet down the middle on the 4' length, then stack the 2 pieces together, and cut those in half. This left me with 4 - 2' x 4' pieces. I took those home and cut them in half so that I ended up with 8 - 2' x 2' panels.
I have an X-Carve CNC machine made by Inventables. I found a black and white Superman logo on the web and imported it into their free Easel software. I resized the logo to make 5 - 6" x 8" logos and 1 - 16.5" x 22" logo. Make sure to rotate the logos to make them upside down and don't just flip them on the horizontal axis. I made 2 copies. 1 with the "S" cutout and 1 without.
I cutout all the smaller "S" logos first followed by the large one last. I then cutout all the backer shield pieces in the same manner.
Once everything was cutout I took the backer shield pieces outside and spray painted them a bright yellow. The paint had a little trouble sticking to the plywood so I sprayed the "S" pieces with a flat black and let it dry for an hour or so. I then followed that with a coat of bright red.
Once everything was completely dry I took them back inside and hot glued them together as it was getting late and the party was going to start soon. They were a big hit!