On Sun, 9 Apr 2017 16:05:42 -0700 (PDT), gdguarino
wrote:

For the uninitiated, a cajon is a percussion instrument, essentially a wooden box with one thin side and a hole in the opposite side. I'm a keyboard player, but have recently developed a hankering to dabble in percussion. Plus, I have a pile plywood scraps lying around.

I've seen various plans online, and I'm sure that there are any number of sound-related variables to consider, but I'm mostly here to ask about structural strength.

One plan I saw calls for a box 12"x12"x18" tall, made with 1/2" plywood. The wrinkle is, one plays a cajon while *sitting* on it. And some of us wanna-be percussionists have put on a few pounds over a lifetime. I'm wondering about the strength of what is effectively a five-sided 1/2" ply box (the front side is made with very thin ply, maybe 1/8")for say, 250 pounds. Will it need corner braces? Or 3/4" ply?

https://www.youtube.com/watch?v=EVZN_mdz7Ks

Here's a vid for you.

Otherwise go south, get a good strong cajun woman to sit on and....