Wow, saw some of the diy cajons! Nice! Great job!
I think one of the best Cajons I've ever played is the Schlagwerk Cajon. I've tried Meinl, Carlos, FatCongas, and a few others. In my opinion, nothing comes close to Schlagwerk. In fact, I'm buying one two weeks from now for my student. If you're going to spend about $600 for a Meinl Cajon, don't. Spend that money on a Schlagwerk. Mile's better. My opinion.