don't know hoiw many of you saw my last cbg , but for those who didn't I think this is worth repeating. For removing the hum out of the amp, I connected the jack to the tailpiece and strings on the outside of the box. Sounds great and look funky, give it a try. It's also nice to make the fix after the guitar is built without having to tear it apart.
Interesting idea to run the string ground on the outside instead of the inside, adds to the "home-built" look.