Building batacajon

Hi, I'm going to try to build batacajon. I'm going to make an octagon style, my main inspiration is ValterPercussion batacajons. In the attachment are the dimensions of each side I calculated from the dimensions on Valter website: http://valterpercussion.com/BatCajn.htm ... Each side will have to be cutted off by 22,5° to make a circle when put together.
Anyone has any tips on how thick plywood to use? Or anyone have the Valter batacajons to measure them?
Thanks
Anyone has any tips on how thick plywood to use? Or anyone have the Valter batacajons to measure them?
Thanks