Thanks Norris, I am very much in the same boat. This is completely an experiment that could have either rewarding or disappointing yields.
I am hoping that the bronze will increase the sustain by ringing/ vibrating like a bell. I also see the possibility that these properties may produce unwanted noise, or runaway feedback. I really cannot see any way to prove this, however, without going through the expense of building the complete guitar.
I am also curios about other aspects of using metal instead of wood, such as: how shielding will be achieved, and how bright the guitar will sound.