Do the tesla coil parts look enough like metal? I'm having a hard time deciding on which $phong and $envmap values to use.
Nobody is going to care about the specular there even if you do it poorly. Everyone is going to be all, "Ooo, lightning, pretty." Don't waste a ton of time agonizing over minutia. You could get away with lots of small haphazard paint splotches in strong white in the specular map and that should give you plenty of metallic shine.