It is a simple layout, and the bracing is simple too. I don't show bracing in any of my plans and instead leave it to the builder with the instructions "brace at least every 18 inches". You'll see that on the "General Notes" page.Where I brace them is right in between the woofer and tweeter, and I use a cross-brace. That ties the front and back together, which is the most important panels to brace. It also ties the sides together. You could add a diagonal to the top and bottom, but I don't find it necessary. The most important panel to preload is the back.