I was wondering if it is possible to make a small sealed box without having to use any bracing? I built 2 small sealed boxes a few months ago. They are 14x14x14 and I used 3/4" MDF to make them. I didn't use any bracing but I probably should have or atleast doubled up the MDF. Would a small box like this work without bracing if a guy used 1" MDF, or even double 3/4" if need be. And if that can be done, my next question is if I used doubled up 3/4" could I make a sealed box that was about 18x18x36? Or if I doubled up the MDF and used just a couple 2x4 braces inside would that work? And if all of this sounds bad can someone refer me to a place that kinda teaches how to properly brace boxes, thanks!