I wanted to do a build in the shed of our new home in Ogden, Iowa, hence the name, Oggy for this relic style CBG.
It plays and sounds good both plugged and un-plugged. It has no sound hole. As of now, I am not happy with the proportions. The box is small. I kept it short scale (55cm / 21 7/8 inches). But the proportion of box to neck does not look quite 'right'.
The piezo was bought cheaply in a ten pack on ebay. It has self adhesive on the disc. I stuck it on the underside of the box lid (top) near the saddle and on the bass side.
I did not add any shielding. It was a 5 min. installation with good results.