It's time to get back to work in the real world. Here is a Mosrite body, almost completely recovered from its brush with water-based polyurethane. Stick with oil-based, water-based is junk.
This one went through a long and torturous build process over almost two years. All I can say is don't believe the "advice" you find on talk_ass. However, in the end, it turned out to be a pretty nice instrument.
This really puts a dent in the whole tonewood argument.
I doubt there is anything very special about those piezos. My experience is that you need the right mounting and electronics to make a piezo sound good, and it has very little to do with the sensor itself, which is just a little bit of semiconductor.