Greetings from down south in Amsterdam. That resonator you've constructed is a thing of true beauty, I saw a metal bed pan the other day. It got me thinking resonator too. I has some very funny looks from people, when I started tapping it near my ear.
I'm in the process of making a 2 string chugger out of a "Diesel Unholy Cocktail box. It's going to be fitted with a 3 pole mag bass pickup. It has an American white oak neck with a mahogany fretboard. All locally sourced and hand crafted. It's a squat, squarish, deep box. It should b great for percussive slide playing.