Here's a tip I thought I would share. I actually discovered this by accident on my first build. It's just an old piece of gutter guard I found laying around. I thought it might make cool looking sound hole covers. So, I cut it to size, lined it up with the sound holes & used little screws & nuts to attach them to the inside of the lid. Mission accomplished. To my surprise there was an unintended result. They resonate like crazy, but in a good way. It actually gives an accoustic CBG a kind of electric tone with super sustain. I took my first CBG to work shortly after I built it. It is completely accoustic. I started playing it & one of the guys said, "Where's the amp? Is it in the guitar?" He was surprised to find out it was just my little sound hole resonators. Anyway, as you can see I've incorporated this into several builds & it always sounds awesome. They also come in a bunch of different colors & one piece can do at least 10 guitars, if not way more. I hope someone finds this helpful.